im throwing a Po300 Changed Wires Cap and rotor. Still runs like crap should i change the plugs and ignition coil

Anyone out there that might have been threw this issue

 

time to do a compression check. I bought a 2000, same situation... had a skip. I thought it was a bad wire or plug, nope... #6 is 1/2 the pressure of the other cylinders. Turns out these motors are notorious for burning a valve.

 

What brand of ignition components (plugs, wires, cap, & rotor) did you install? Many on this forum & others have tried to install aftermarket parts only to find that they were defective out of the box. You can generally get by on the wires, but these trucks are very picky about the cap, rotor, & plugs so for those you need to go with AC Delco.

You can search for P0300 to see what others have experienced with this code, but be forewarned, it is a somewhat general code and can have a variety of different root causes.

I have moved your thread into the 2nd Gen Tech section where questions of this nature belong.

 

Get a can of Mass Air Flow sensor cleaner from a parts store and clean the MAF sensor with the spray and let air dry. DO NOT touch the MAF sensor with anything other than the spray from the cleaner.

Good luck...

 

I agree with Kyle in post #3 100%

P0300 is almost always caused by a fault in the secondary ignition system, (plugs, wires, cap, rotor, ignition coil). It can't be stressed enough about the importance of using AC Delco ignition parts, especially the cap, rotor and plugs. P0300 can also be caused by incorrect camshaft retard, low fuel pressure, dirty MAF sensor, worn distributor bushings, and worn distributor drive gear. If one particular cylinder is constantly misfiring, the PCM will set a DTC identifying it specifically, rather than setting the P0300 which means more than one cylinder is randomly misfiring.