what would make the multi piston misfire code come on on 2000 Oldsmobile Bravada

it runs like it has a plug not fireing i replaced plugs wire coil .someone told me it could be the fuel pump

by in Iva, SC on October 01, 2012
2 answers 1 comment
ANSWER by on October 01, 2012
not necessarily the fuel pump could be coil pak. what is your eng code?
COMMENT by on October 01, 2012
no not the coil just just replaced it .im just not that lucky. the code says multi piston miss fire .i didnt think the fuel pump would make it act like that .but im runnin out of options. dont know the exact code my little cheap code reader just said the multi miss fire
ANSWER by on October 01, 2012
4.3L V/6 POSS. FUEL SPIDER. HOOK UP FUEL PRESS. GAUGE TURN KEY ON THEN OFF PRESSURE SHOULD HOLD FOR ABOUT 5MIN. IF NOT IT IS FUEL RELATED. MAY NEED TO TAKE IT TO A SHOP. AS THIS PART I MENTIONED (IF IT IS THE PROBLEM) THEN THE INTAKE PLENUM WILL HAVE TO BE REMOVED. PRETTY BIG JOB TO SERVICE THE FUEL INJECTORS. AGAIN "IF" THAT IS INDEED THE PROBLEM.