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need help!!!

i have a 88 t-bird 5.0L it has bad gasmileg 13mpg on a good day about 260miles on a full tank, how do i get it back up, and when i start the car it has a high reve and some times stalls out, dose any one know what is going on, if any one has qustion u can send me a message on msn or on the form.:birdsmily:
[SIGPIC][/SIGPIC]
88 5.0L aod with duel flowmaster and speedo mod
88 5.0L H.O with 5 speed R.I.P
87 3.8L no trans. geting h.o and 5speed (project never ending thunder) started it as of 8-14-10
96 bronco xl 5.0L 5 speed man4x4
:birdsmily:

need help!!!

Reply #1 –
i'd start with looking for vacuum leaks for the high idle.
:cougarsmily:5.0 HO, E303 cam, Exploder/Cobra intake, smog pump delete, Ford Taurus electric fan, MAF conversion, BBK headers, MAC 2.5" off-road exhaust w/x-pipe, AOD w/shift kit, 8.8 Trac-Loc rear w/disc brakes, 5-lug conversion w/'98 Mustang GT 17" wheels, Mach 1 springs:cougarsmily:

need help!!!

Reply #2 –
Is that city or highway mileage? Are you driving any great distance, or only short hops? 13MPG isn't out of the norm for these cars in the city. I get about 28-29 highway, but only about 13-14 city
2015 Mustang GT Premium - 5.0, 6-speed, Guard Green - too much awesome for one car

1988 5.0 Thunderbird :birdsmily: SOLD SEPT 11 2010: TC front clip/hood ♣ Body & paint completed Oct 2007 ♣ 3.55 TC rear end and front brakes ♣ TC interior ♣ CHE rear control arms (adjustable lowers) ♣ 2001 Bullitt springs ♣ Energy suspension poly busings ♣ Kenne Brown subframe connectors ♣ CWE engine mounts ♣ Thundercat sequential turn signals ♣ Explorer overhead console (temp/compass display) ♣ 2.25" off-road dual exhaust ♣ T-5 transmission swap completed Jan 2009 ♣

need help!!!

Reply #3 –
its city
[SIGPIC][/SIGPIC]
88 5.0L aod with duel flowmaster and speedo mod
88 5.0L H.O with 5 speed R.I.P
87 3.8L no trans. geting h.o and 5speed (project never ending thunder) started it as of 8-14-10
96 bronco xl 5.0L 5 speed man4x4
:birdsmily:

need help!!!

Reply #4 –
Sounds pretty good to me for a 5.0 . I'm not getting much ( if any) better with a 3.8 . I went 270 on a tank full, but I dont fully trust my guage, so I put more in it. Most of mine is stop & go traffic.

need help!!!

Reply #5 –
thats with me leadfooting it some times:birdsmily:
[SIGPIC][/SIGPIC]
88 5.0L aod with duel flowmaster and speedo mod
88 5.0L H.O with 5 speed R.I.P
87 3.8L no trans. geting h.o and 5speed (project never ending thunder) started it as of 8-14-10
96 bronco xl 5.0L 5 speed man4x4
:birdsmily:

need help!!!

Reply #6 –
also my check engine light it on any tips on that too:birdsmily:
[SIGPIC][/SIGPIC]
88 5.0L aod with duel flowmaster and speedo mod
88 5.0L H.O with 5 speed R.I.P
87 3.8L no trans. geting h.o and 5speed (project never ending thunder) started it as of 8-14-10
96 bronco xl 5.0L 5 speed man4x4
:birdsmily:

need help!!!

Reply #7 –
Pull codes.

Also, From "E" to full, I can get usually 15-16 gallons in the tank. 260/16=16.25mpg. Not bad, but is that city or more of stop/go traffic?

I average 21mpg in "city"(suburbs) if I don't have to sit in stop&go traffic (which drops me to 17-18 in traffic/downtown that averages 15mph). 28-29 mpg highway. Unless I make long trips, I fill up when I pass 300 miles on a tank.

If you're getting the above 16mpg, instead of 13, I'd say you're about where you should be. In my opinion, 13's quite low and a tune up and such may help a lot. When were things last replaced? Oxygen sensors? Spark plugs? Vacuum lines?
1988 Thunderbird Sport

need help!!!

Reply #8 –
Pull the codes - no way of knowing why that light is on without doing so
2015 Mustang GT Premium - 5.0, 6-speed, Guard Green - too much awesome for one car

1988 5.0 Thunderbird :birdsmily: SOLD SEPT 11 2010: TC front clip/hood ♣ Body & paint completed Oct 2007 ♣ 3.55 TC rear end and front brakes ♣ TC interior ♣ CHE rear control arms (adjustable lowers) ♣ 2001 Bullitt springs ♣ Energy suspension poly busings ♣ Kenne Brown subframe connectors ♣ CWE engine mounts ♣ Thundercat sequential turn signals ♣ Explorer overhead console (temp/compass display) ♣ 2.25" off-road dual exhaust ♣ T-5 transmission swap completed Jan 2009 ♣

need help!!!

Reply #9 –
have not had a tune up sence i got it in like 2000 or 2001, my dad drove it for like 6 mouths and parked it till about 2006 when i got it.
[SIGPIC][/SIGPIC]
88 5.0L aod with duel flowmaster and speedo mod
88 5.0L H.O with 5 speed R.I.P
87 3.8L no trans. geting h.o and 5speed (project never ending thunder) started it as of 8-14-10
96 bronco xl 5.0L 5 speed man4x4
:birdsmily:
 

need help!!!

Reply #10 –
i get 11.5 mpg!! you guys are all lucky!!
1988 LX coupe. a dressed up motor with full exhaust and BBK shorties with flowmasters, BBK CAI, accufab 65mm tb, HO upper intake, cobra valve covers.