p0300

Hello all. First post here. I've got a 2003 Avalanche that has been nothing but trouble since I bought it. I'm looking for some perspective. I've read ALOT about P0300 and am still struggling to figure what the heck is going on. I've replaced plugs, wires, coils, fuel pump, fuel filter and...

I replaced engine with 5.3 from 2003 Tahoe donner. (Never done this before. All by myself, alone, with helps from YouTube). Engine started right up. Take for test drive- feel like transmission shifting not normal and engine stalls after 5 min driving. Shut it off, engine will start and Avalanche...

Hi. I've got a 03 1500 Z71 with a Vortex 5.3lt V8 with a P0304 code that I can't clear. Its only got 16000 on the motor and this code just appeared during this virus situation so the truck really hasn't been driven in the last 8 months. Maybe 100 miles this year... I brought it to my mechanic as...