I have a 95 z28 camaro with 150 k miles on it....that past few weeks ive been having a horrible stumble/hesitation problem...parts ive fixed
Egr valve
Fuel Filter
o2 sensors
fuel injectors
tps sensor

Nothing has changed, maybe a lil fix on the rough idle , but now the car turns over but doesnt wanna start... i cant seem to get rid of the hesitation...anyone have any ideas on what it could be?? opti?? ive never changed it before and wit 150k miles on it,,maybe huh?? any ideas would help thanx alot

 

Check your wires for breakage or it very well could be a bad opti...

 

check for power in and out of the coil

 

Check all the regular stuff first to be sure but I am betting your cap and rotor are shot and most likely the bearing in the opti is toast as well.
I had about 134k on my opti when I replaced it, the cap and rotor looked nasty and the bearing was going.

 

Dude You want to check the MAP and MAF connectors for loose wires...

Pull the connectors out, clean them and dont forget the Fuel injectors too. Mine was dropping one injector. It was on and off randomly but you coud tell it was just one cylinder..

I pulled all the connectors out one at a time and cleaned the conector and the Injector contacts. It fixed my cylinder problem. I didnt try to figure out what cylinder was not firing. I just cleaned them all. Eventually I would have done them all one at a time anyways.


Get yerself a six pack and polish then connectors clean as a pastime. Do not worry cause if you do then the whole job sucks. I take my sweet time to do things in the car.