I recently had a new cat. converter, 100,000 tune-up, fuel gasket, fuel flush, temp. sensor in the past 5 months. Today I had a code that read PO300. Can this be due to a faulty part or labor? I acclerate and the car is bogged down. I have cont. brought this car in it seems every 3 mo.'s , and it seems there is a new problem that arises. It is a 2001 Chevy impala. HELP
It is at Pep boys now.

P0300 - Random/Multiple Cylinder Misfire Detected

you might just have to change your plugs and plug wires, at 100K that is needed.

also check your PCV valve

also check your PCV valve

What engine size?

Fuel system problems to include fuel injectors can give P0300 DTC error codes. Even though you had fuel system work was the fuel pressure ever checked at the fuel injector rail or fuel pressure regulator to see if it is in specs?

fuel gasket and a fuel flush?? What exactly did they tell you they were going to do?

fuel gasket and a fuel flush?? What exactly did they tell you they were going to do?

Yeah, thats a good one Troy. I was assuming fuel injector service? :dunno: