Fubar 5.0

i just put a used edelbrock performer intake on my 87. i started it up and it wont idle, runs real rough, backfires and acts like its misfireing. i checked the timing more than once so its right on. i made sure all the plug wires were right (even though i didnt touch them to begin with) and i cant find any vacum leaks. someone told me that i needed to reprogram the cumputer or put a chip in it but i dont see why i would need to since all i did was put on a intake. my father keeps telling me to put it back to stock but i dont want to unless i have to so any help would be appreciated.

cammedlx

Sounds to me like you have a vacum leak somewhere and its causing the car to lean out,Possibly the lower isn't sealed up as good as you think it is.

mustang8719

I had the same problem with my car when I put the intake on.I found a vaccum leak under the throttle body from the lower intake.

luckythirteen13

if the wires are all hooked up right, it sounds like a vacuum leak. look really good for a vacuum line that you did not hook up.

stanglx2002

you have a vaccum leak and the best place to check is the side gasket

Djs94stang

Hopefully the manifold is not warped but it does sound like a vacuum leak. I know this is stupid question but are you sure that all the vacuum nipples are plugged?

Fubar 5.0

well i cant find any vacum leaks but im still having the problem. something i forgot to mention is sombody tried to port it themselfs, if they went to far would that screw it up?

Tims 88GT

that is a big 10-4, did you look it over before you put it on? you should of had it fluxed it dose not cost much.

silver91gt

sorry to correct you, but you cant magnaflux aluminum, they use a dye penetrant.

I am a mag particle inspector.

flamin87

one of the best ways i find these leaks is with starting fluid. with the car on spray where the upper and lower meet. or around the hoses, if the car instantly kinda revs up that is where your leak might be.