2003 4.2L Trail blazer P0300 Random m...

2003 4.2L Trail blazer P0300 Random misfire

Brian

Easley, SC

#1 Sep 10, 2010
Started with P0305 code, replaced the spark plugs and then the #5 coil. Code changed to P0302. Replaced #2 coil and the fuel filter. Runs a lot better but now have P0300 random misfire code. The code only comes up going up hill, no light when engine is idling. What next???
moo

Arbil, Iraq

#2 Nov 2, 2010
your problem is the catalatic converter
royce_onishi

Ewa Beach, HI

#3 Dec 18, 2011
i had low compression on cyl 3 found out it had a burnt valve,removed the headhadit machined reassemble everything. upon first start up i had low idle and misfire #5 cyl,switched #5 with #4 and runs a little better but now gives a p0300 random misfire. any ideas ???
wiliam

Stevensville, MD

#4 May 28, 2014
misfire and smell gas
jerdoy77

Moscow Mills, MO

#5 Apr 4, 2015
04 trailblazer it all started when I ran out of gas when I started it back up it missed light flashing p 300 code replaced a coil and new plugs and cleaned injecters..still missing idk what is wrong.
Sjm53

Yuma, AZ

#6 Jun 3, 2015
jerdoy77 wrote:
04 trailblazer it all started when I ran out of gas when I started it back up it missed light flashing p 300 code replaced a coil and new plugs and cleaned injecters..still missing idk what is wrong.
Jerdoy77, this exact same situation is happening to me now, suv was fine- I ran out of gas and now it's misfiring, but I got a code saying cylinder 1 misfire, so I pulled the coil and found oil- then I pulled all coils and every spark plug well was full of oil, last night I changed the valve cover gasket and it's running a lot better but now the cylinder 1 misfire code changed to p0300 random misfire, I'm changing plugs today to see if that clears it. Did you ever figure yours out

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