2007 gmc sierra 1500 classic extended cab 4.3 v6

gmc
sierra1500

#1

I’ve done a tune up, spark plugs wires cap anyway theres still a misfire on the number 5 cylinder the stats are as follows; P0305,P0102,P0128,P0200 can anybody give me some direction thank u in advance.


#2

perform a compression test and report the numbers

perform a fuel injector balance test . . . this particular fuel injection system sometimes gets sticky injectors

But don’t throw more money at it, until you’ve done some more testing


#3

Thank you for the information i will check compression