Wondering if I could get some help here. I have an 89 Corvette. Original owner with 31,000 miles. Car recently started idling very rough. Doesn't happen right away but as it warms up it gets really bad. It almost feels like a couple of cylinders are down. Car feels like it wants to shut off on me. No smoking, No Check Engine Codes. Could it be the Fuel Injectors? They are the original ones and this car sits for long periods of time. When I first bought it, it would start immediately but now it cranks for a while before it turns on. Hoping that someone here could shed some light on this for me.

 

r u just bring it out of storage?

r the plugs foul with debris?

do u smell excess fuel before car starts?

 

Appreciate the response. I guess you can say it's being brought out of storage. The car was running fine. Last year I had the water pump changed and the car started acting funny on the way home. I did question the mechanic and ofcourse he said that one thing had nothing to do with the other. I thought to myself, could my luck have been that bad that something else went wrong around the same time. At that point I couldn't argue with the guy. I checked all Vacuum hoses and everything seems to be in order. No smoke. No error codes. The car turns on and starts out fine then as soon as it warms up it starts to shake and sputter as if it is running on 6-7 cylinders. If it was plugs or cables it would start out sputtering from the beginning. Should I throw some fuel injector cleaner in there to see if it makes a difference. The car does sit for long periods of time. No fuel smells.

 

plugs could take a bit, wires should act up right away, but usually these things are more noticeable at higher speeds then at idle

well i would try fresh gas after u drain the tank, also would put some type of fuel cleaner in system

is there anything else u notice
u start the car and does it run smooth?

if u sat there and revive it up a bit how does it run?

u put it in drive but do not move do u feel the miss?

at what speed do u notice the miss?

 

I start the car and it cranks for a little bit before it attempts to turn on. Once on it seems to idle okay but then as it warms up it starts to idle rough. If I put it in drive, you really feel the shaking. If I drive it like that then it feels like it has no power. You know, I never thought about the gas. It's still on last years tank. I am going to try the fuel cleaner injector cleaners that you put into the tank to see if it makes a difference. If not, I can't imagine it being anything other than the injectors themselves. The car only has 31,000.00 miles on it but I guess sitting around for long periods of time doesn't help. (TIME TO SELL) LOL...

 

I just finished going down that road...change your injectors. I changed everything but and then finally changed them and all my problems went away and car runs like new. Rockauto has them for around $30. each.

 

It has to be the injectors. I added fuel injector cleaner on Wednesday and took the car out for a ride. After about 10 minutes, it completely cut out on me. Had to get it towed back home. It cranks and wants to turn on but then just keeps cranking. Injectors have to be shot.

 

before u put injectors in pull a spark plug and check if u have spark!!!!
also
put a fuel pressure gauge on the system and check pressure