Question

P0300 Chevrolet - 2003 s10 4.3 misfires when going up step hills for long periods. Engine when also make a chattering nose like a fuel problem.

Answer 1

HI there

Here is a list of possible causes for this code. I would also check the fuel pressure and the catalytic converter since the issue is more predominant going up long grades.

P0300 CHEVROLET - Cylinder Misfire Detected Random Cylinders

Read more: https://www.autocodes.com/p0300_chevrolet.html