Help please. car running terrible

[turnerracing]

So i was driving my car sunday and it had a real bad miss and when you got in the gas it bogged down then picked itself back up. When you were driving down the road it would run good then all of a sudden start running bad. So i took it home and let it set. Then drove it again tuesday and it ran ok not the best but lots better then sunday but when i went to drive it today it was missing again so it didnt even try driving it anywhere. Sorry so long lol but any advice.

[meissen]

Is it throwing any codes at all? SES light on? Does it have EGR or AIR? How new is the optispark? Is it only doing it once warmed up or all the time - cold and warm?

[turnerracing]

The ses code is not on, it has EGR and AIR, The opti never been replaced 100,000 + miles, it kinda does it when cold but its gets realy bad when it warms up.

[my1994z28]

Sounds like the opti is on its last leg.

[99TransAmWS6]

id venture to say opti-spark as well.

[meissen]

Need to find someone that can pull any stored codes - unfortunately, one of the most telling codes that it's the optispark does not trigger the SES light to come on.

Unfortunately, if there are no codes stored, it's a guessing game at that point. 100k+ could mean it's the optispark but I'm not going to just jump to it just because it's an optispark car like everyone else does.

It could be the coil blaster is going bad and getting heat soaked.

Do you notice it idling any higher than normal?

[jfo6900]

Ya I wouldn't just start throwin parts at it...get it scanned first but an opti wouldn't ne a bad idea since yer getting up there in miles

[MP81]

I think the opti is doing what it does best - failing.

[my1994z28]

I dont think we were "jumping"to anything,especially when the opti has over 100,000 miles on it.Normally when these lt1s start to run bad the cause is the opti.

[turnerracing]

ill just drive the car to work and get it scanned hopefully i can figure it out and get it fixed before the meet

[Bad_Z28]

I dont think we were "jumping"to anything,especially when the opti has over 100,000 miles on it.Normally when these lt1s start to run bad the cause is the opti.

Brians just looking at all possibilites. It seems to many people just point their finger instantly at the Optispark. The car could have countless things wrong with it making it run rough. And all parts including the opti could go bad at 10K miles. And many optis and other parts have lasted far past 200K miles.

Good luck getting the car scanned, hopefully it pulls a code. Be sure to check over all your wires and make sure none are arcing to any metal, or burnt on your headers/manifolds. Check your spark plugs aswell, have they been changed recently?

[my1994z28]

If I remember correctly,his drivetrain is 94 which is obd1..I didnt think that they stored the codes?

[turnerracing]

Well i scanned the car didnt pull any codes so im going to seam foam it put and new fuel filter in it and see where that gets me

[steddy]

Make sure you change the oil afterward. a lot of grunge will be in it afterward. I'm sure you know that but just throwing it out.

[98blackbeauty]

This sounds more like egr problem. get block off kit from summit. cost 20 bucks or so. Have you checked that you don't have a burnt spark plug wire. Check around someone may have a used 94 opti you can test with before buying a new one.