ok, i have a 92 mustang gt and i went to get my tail pipes put on and have my h pipe lined up right at MIDAS.
the next day it is running like complete ass, so i popped the hood and noticed they messed with stuff after i told them not to open my hood.
anyway, i finally unplugged my MAF and it ran smoother at idle but had no performance and my gas mileage went to shit. so i got another MAF thinkin that was the problem, but it wasnt. then i asked ray wat he thought and he said it could be the computer.
so i took my computer out and somethin was raddling inside, so i took it apart and saw that one of the little capassitors was blown. then i got a new one and put it on, now it runs a little better BUT now the idle jumps up and down non stop between 700 and 950rshared_pm. and because of that it stutters. if i unplug my maf the idle will be smooth again

so if anyone has any idea wat this would be a would really appreciate it.
this is my daily driver

 

The computer may have learned bad habits while it had the bac capacitor. (There are 2 more of the little blue bastards that tend to leak and crap out. You probably should have replaced them while you were in there and had the soldering gun hot.) Take the negative battery cable off for abouthalf an hour or so. then hook it back up. Drive it around for a while and let it relearn. If that doesn't help, try resetting the TPS and the idle.

Oh, and make sure Midas didn't screw up the O2 sensors.

 

well my friend was sayin that midas probably left the battery conected while they were welding and touched the o2's and thats why the litlle fuse thing blew

but ill try the battery terminal thing and ill let u know wat happens
thanks

 

ok so i the battery thing and it didnt work. thanks though

so my friend said it could be a vacuum leak, electrical problem, or my injectors.
so ripped the the upper intake, injectors, wires and plugs out. and everything looks ok to me.
i have no idea wat the problem is
i really need some advise

 

if someone has an idea give me a call ANYTIME 813-407-3363 Wes

 

when the car is warm, what is the TPS voltage?

 

Erratic idle is symtom of vacuum leak.

 

the tps is at .98
and my friend thinks its a vacuum leak too, but there arent any leaks

 

How did you check for the vacuum leak?
I would try to re check for a vacuum leak using soapy water & a stethoscope or a hose or tubing should works... So if there is one you can see it and hear it.

And just a few shots in the dark here...
It could be the intake manifold gasket? Did you pay attetion to its condition?
Does the car still have have the egr? A bad/leaky egr could cause it..
And I would replace your pcv and double check your timing to be safe...
Also do you know your fuel psi at idle?
Maybe try a new computer??

 

gasket still looks like new, i put the explorer intake on about 2 months ago. and replace the pcv valave when i did that. also have a bbk fuel pressure regulator and gauge so i can see the fuel pressure and it reads where it should be.

and the egr, we left disconected when i did the intake because the fuel pressure gauge there i cant plug it in. but its been like that since i did the intake and there was never a problem


but i will try the soapy water thing tomorrow when i put it all back together.
thanks