My camaro is throwing a multiple misfire and flashing check engine light, I’ve changed the sparks and wires, the ignition coils, the fuel pump and filter, it will randomly run fine then seem to lose power and get it back again it’s a Manual transmission

 

I assume since its a 97 and you said coils that this is a 3800?

Does the the miss fires point to a specific cylinder? Certainly sounds like an engine analyzer with a built in scope would point out the issue. ICM and MAF sensor are also likely problems or the connectors leading to them. With a 20+ year old car connectors can become issues.

 

yeah it is a 3800 and it’s not telling me which cynlinder is causing it but I have noticed that a lot of the work I’m doing is replacing OE parts That I feel shoulda been replaced years ago. Anywhere I can take her to have the connects and wires checked out in California?

 

Sorry can't help with where to take, if you still have cars shows or cruises you could ask the people there. Most shops that decent will have an engine analyzer. Dealership would have on but that does not mean the mechanic know you 18 year old tech very well.

You could try a tap test on the MAF sensor, with the engine running at idle tap the MAF sensor with the handle of a screw driver and listen for a change in the engine. You can do the same thing wiggling the wires to the MAF and the ICM. If you hear the engine change something is not right.

 

The pcm can tell you the misfire counts by cylinder, but you would need to use a high end scan tool like a Tech II or equivalent.

 

UPDATE: so I was able to replace all injectors and hooked her back up and she is giving me NO pressure. There’s no gas leak and I hear the NEW pump starting up but when I check on the Schroeder valve it guzzles Out showing weak pressure so my question is, before starting the swap for the injectors my pressure was prefect now my car won’t start up, any ideas where I messed up? Could it be the fuel relay?

 

run power to the service/prime wire for the fuel pump so you can manually turn it on. does it look like there is air in fuel. maybe try an unhook fuel line at the fuel rail or fuel filter and run pump to make sure you are getting good flow to that point. take filter off and see whats in it if anything and make sure its not plugged with something.

 

If you hear the pump and have no fuel pressure and no visible leak it pretty much needs to be an issue with the pump.

Just a FYI, I put three airtex pumps in my 96 before I got a good one. One left me sitting in rush hour traffic after just 2 days of being installed.

 

so I changed the sparks plugs and wires, fuel filter and pump along with fuel injectors, the coils are new too. I’m starting to think it’s an airflow issue. It’s running reallly rich