i got a 2001 blazer 4.3l 4x4 with a cylinder 2 misfire that comes and goes every couple days sometimes you can feel the miss others you can't. i've replaced all common parts, plugs wires dist. rotor, also did compression on all cylinders all was fine. Replaced the fuel pump last week because the dealer dropped the tank for a sensor and broke the supply line fitting but god forbid i told them that because they can't do any wrong so i did it myself with no problem. Did the A.I.R. pump yesterday because there was a code for that also but the miss has been happening for about 1 month now im kinda stumped my only guess now is that its an injector? it is hard to start, if i push on the pedal when starting it doesn't make a difference, i was thinking maybe an injector seeping but nothing.

 

try checking the ignition coils and also look for a vacuum leak and also it could be a faulty injector

 

i was looking around in the engine today just curious took off the intake and opened the throttle body and it was wet so now im thinking could it be the fuel pressure regulator? i know there have been some problems on these engines with the fuel issues under the intake so any1 have a similar find or problem?

 

with the plenum off turn the key to the "on" position..this will activate the fuel pump and send gas to the injector unit..see where the leak is..

 

thankyou for the tip

 

i replaced the FPR today the check engine light went away and it runs smooth now the only other question i have is my RPM's are at 550 is that correct?

 

your idle will vary based on conditions such as weather, engine temp, etc. 550 is fine

 

kewl then everything is fine for now hopefully for a long time thankyou