Grounds to heads
 

Guys, just bought 96 Blazer LS 2 door. I have been chasing P0300 code on it. Was trying to check grds , on grds to the heads,how do you even see them, let alone check them !!!
Sherman

what do you need to check the grounds for? I don't think that has anything to do with that code you have. I think a p0300 is a multiple cylinder misfire.

yea it is. its just time for a tune up dude. and possibly a camshaft position sensor

I'm just checking everthing that might have anything to do with the P0300 code. 63 FP on prime,56 while idleing,has good compression on all cylinders , new cap & rotor, new wires & plugs , new dist gear, new crank sensor , vacuum is about 18 at idle .
Also , FP doesn't leak off when its shut off,will hold at 52 for at least 20 mins.
I think I have at least 1 bad 02 sensor (02S12 on my Actron CP9185 scanner if I'm reading right ,just got it) , will see about replacing it tomorrow.