So my camaro has been throw the p0300 code constantly. And runs horribly. I've done several things to it each time making it run good a couple days then back to crap. All new coil packs. Plugs/wires. New injectors. Fuel filter. Air filter. Removed intake and scrubbed it spotless. At this point still runs and drives until I put on a brand new MAF. After this anytime I touch the gas it wants to die. Any ideas would be much appreciated.

 

could be a fuel pump problem

 

Runs terribly,I put on a new MAF and it will barely move. What could this be? It got 10x worse with the new part. If I put the old o e back on I can run and drive,still very rough...but will drive.

 

Checking fuel pressure would be a good idea. Failing pumps can vary fuel pressure from one day to the next and I have seen people go nuts think because they change something it "help" but in reality it was just a random furl pressure issue.

But

"Runs better every time you mess with the engine. Now its running worse all the time."

That almost sounds like the prefect description of the symptoms of a bad connector. At first anytime you touch the connector it starts working but after awhile the poor connection builds up carbon and then it runs bad most of the time unless you are pushing on the connector.

The trick to finding a bad connector is when the car is running good wiggle everything. This could be any connector in the EFI or the ignition system.

If the fuel pressure is good and the car is running poor for an extended time and random misfire is the only code I would suggest the MAF connector. Assuming on a nice day the car runs better with the MAF connector disconnected. This is a shot in the dark, but I have seen it twice now.

 

OK makes sense. I was told I should drop the tank pull the pump and see if the end of the suction tube was near clogged. When I bought this car it had sat for over a year with full tank. I know the tank is in pretty bad shape as I've changed the filter 50 times. I fuel pressure tested it for the first time yesterday and it was at 45 running at idle.

 

By connectors you mean the plug itself? Like I could cut it off and splice another one in? I got a partial spare wiring harness with the car.

 

i was thinking the same the check fuel pump pressure or a connector ground of some sort bad wireing .i learned from the best gorn ,at takeing a guess after you have done everthing else,? you access the the pump easyer from the top by makeing a hole you can cover up or close under the carpet right at the back from you hatch back ,rather then dropping the tank with a small cut wheel ,there should be a thread hear to show you where to cut, but be careful,saves alot of labor on pulling the tank,an you have acess door for next time too,did it to both mine 4th gens or google it all over the net

 

Never install used connectors. 95% of GM connectors are available.

Rockauto
1997 Camaro
Electrical connectors
You will see just about every connector on your car.
More Information for STANDARD MOTOR PRODUCTS HP4240

The advise I was giving is the "there nothing left to try" situation. If you have done 50 filter changes, that is about 48 more then you should have. Look up the hatch method for changing the fuel pump. You can clean out your tank using the same method, it should not take you an hour to do it.