THE86GT

Is this a big problem for this year?? and what does it sound like when its missing. Im really new to working on cars so please dont laugh.

86 5.0L

I never had this problem [&:] when I start my 86 it revves to 2000rpms for a sec then drops to 500-800 rpms depending on the weather

frdmstng1986GT

does it smelllike it's running rich?..mine does the same thing as you described but is running kinda rich.. i replaced everything i could think of..ect, iac, pcv valve and screen and the rubber gromet that the pcv valve goes in, cleaned the tb and egr spacer, adjusted tps.. checked fuel pressure and it was good.. checked timming.. everything i could think of.. so i think i might have a leaky injector so those are getting changed this weekend along with putting all new gaskets and seals in it.. so hopefully it will stop the eratic idle crap.[:@]

ZachW04Stang

Did you replace the cap and rotor? Check the fuel pressure w/ a guage at the check port. Ignition modules on these cars are crap and can cause problems. I wouldn't just through one at it and hope it fixed it but maybe replace it if you can't find the cause.

gtdogs

i replaced the cap and rotor and the fuel pump and filter is about a month old but im gonna check the fuel pressure again i am going to replace the modual. when i hooked my scanner up on the koer it said it wasnt reponding but on the koeo it did ok

gtdogs

thanks for everyones input it turned out that it was the ign modual i have never changed one unless the car wasnt starting.i left the battery disconected all night and tested it this morning its running alot better.now i can install my gears and stahl converter the trany just got done with transgo reprogramer thanx

whiteout 5.0

compression test

ih8chevy

^^^^^ exactly u probably have no compression in a cylinder or a couple so definetley do a compression test