I’m not having much luck with this so figured I might as well ask here. I am on the trip from hell over these 2 months. When I left the car was fine except for a clutch pedal catch-point problem. About half-way through the trip, the fuel pump started to make a buzzing humming noise and 1 day after I arrived at my destination 800 miles from home, it seemed to pretty much quit. Managed to get the car started, drove it with stuttering and lurching to the nearest repair shot, paid them $600 for a new pump and fuel filter and then - the buzzing humming noise was gone, but the stuttering, lurching was not only still there, but has become worse. So after about 2 weeks of test driving it, yesterday it got way worse and threw a p0300 code. That doesn’t help me since I already knew about the general misfire and what I really need is to nail down the most likely cause so I don’t just start replacing everything. I changed the air filter and cleaned the throttle body yesterday. I don’t have any of my tools or anything with me so I don’t know whether to just pay some shop to tell me more detailed diagnostic info or what. But I doubt it will make it back home as poorly as it is running now. My assumption was that the fuel injectors must be clogged but I really just don’t know. Could all my problems have been from bad gas on the trip? What should I be looking for as the most likely? I am assuming the place didn’t put in a bad fuel pump to replace the original pump.
Any suggestions? The plugs were just replaced 2 years ago. Oh - and one more clue - the car idles fine. You wouldn’t know there is a problem until your basically asking the most power of the engine and for me that is accelerating in 2nd and 3rd gears. The more I hit the gas, the worse the problem. If it is just one cylinder, it would be cheaper for me to deal with that cylinder’s injector, plug, etc…but with this p0300, I am not even to that point yet and can’t just replace everything.