88gt backfire and trouble with idle

[Kakarotto05]

Hey guys, i just got out my mustang after a long and dreadful winter and i'm having a few problems...any help would be appreciated. I have an 88 gt and when i got it out, my car had a little trouble accelerating and had some backfires. It only backfires when i accelerate fast. I thought it was possibly some bad gas but i used all of that up and ran a tank of premium through it and it still doing the same thing. It also has a little trouble with low idle and sometimes stalls out...i think this is a leak in the vaccum line. Could a vaccum leak also lead to the trouble in accelerating and backfiring? If not any suggestions on what it could be? Thanks a lot i appreciate any help.

 

[Jmunk]

Sounds like a ignition issue.

 

[Mustang5L5]

run the codes

 

[HISSIN50]

If you're SD, a vac leak can cause a rich condition which allows afterfires.

Pull the codes and check your vac signal. You should see nearly 20" hg at idle.

Good luck.

 

[Mustang5L5]

More than likely it is a vac leak.

Cold dry winter leads to cracked vacuum lines and leaks.

 

[aaros]

mines kinda doing the same thing, how and where do you check the vac signal?

 

[Mustang5L5]

Spare port on the vac tree would be a good starting point.

You can also spray around the motor with carb cleaner. If there is a vac leak, the engine's RPM will rise

 

[Fsg231]

if its sputtering, u can also have a secondary ing. problem, like ( plugs, wires, cap rotor ) also check ur fuel relay, mine had my pump at full tilt all the time...