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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
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1988 mustang gt

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Old 06-24-2014, 09:04 PM   #1
Join Date: Jun 2014
Vehicle: 1988 Mustang GT
Location: Connecticut
Posts: 4
Default 1988 mustang gt

Hey everyone. Just joined the forum. I wanna say thanks in advance for all the help. A few years ago I bought an 1988 mustang gt. The person I got the car from said he did a bunch of work to it but I can not confirm. (?)= can't confirm. This is what he told me. It's a 302 bored (?) Steel crank (?) Forged poisons (?) Cam (?) Trick flow heads (?) Trick flow valve cover trick flow intake plenum msd set up 373 rear (lie it's the stick gear ratio but ford racing). So when I got it she wouldn't run right so I brought it a speed shop and he said he had to do a mass air conversion and change the computer in order to dyno tune it. In the process of trying to dyno tune found out the brakes were shot in back and master cylinder. It then needed a whole tune up plugs wires cap rotor ignition module on distributor msd spark box on fender rebuilt rear end and 500hp fuel pump. Car ran great but had sat for 2 years in storage and tried getting it going today. Turn the key and it would catch then shut off. After a while I got it to run and took it around the block and it sputters and stalls at stops. The ignition module on distributor just replaced today and msd spark box on fender. Replace with 10 gal of 93 gas. Any ideas?
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elynch1206 is offline   Reply With Quote
Old 06-24-2014, 09:55 PM   #2
4th Gear Member
Join Date: Jan 2007
Posts: 1,108

My guess is this is a side effect of 2 year old gas sitting in it. I'd probably let it idle for awhile (30 minutes or so) and see if it works itself out of it.
'91 GT 5 Speed
Maxwelhse is offline   Reply With Quote
Old 06-25-2014, 06:35 AM   #3
Join Date: Jun 2014
Vehicle: 1988 Mustang GT
Location: Connecticut
Posts: 4
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I put filled it with new 93 octane gas yesterday and ran it for 3 hours sir.
elynch1206 is offline   Reply With Quote
Old 06-25-2014, 07:27 AM   #4
5th Gear Member
Join Date: Jul 2012
Vehicle: 1990 lx hatch 5.0
Location: ohio
Posts: 2,913

Originally Posted by elynch1206 View Post
I put filled it with new 93 octane gas yesterday and ran it for 3 hours sir.
Did you remove all the old gas? How much fuel was in the tank while it sat there? There are a number of things that could cause a car that's been sitting for 2 years to run bad or not start. For instance the fuel pump sat dry and may be no good any more, the fuel filter is plugged with debris, the spark plugs are now fouled , if you didn't drain the old gas out adding new gas does not make the old gas instantly good. The fuel injectors have sat uncycled for 2 years and may be sticking. The fuel pressure regulator sat dry and uncycled possibly the diapham is cracked or not functioning. Just a slew of things to check .
dawson1112 is offline   Reply With Quote
Old 06-25-2014, 07:27 AM
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