Hi, I have a 99 Gmc Jimmy that im having some very irritating problems with. My truck only has 91000 miles on it and have certified service records where GM replaced the engine at like 8000 miles. My ses light is on throwing codes p0300 p0172 p0174. Very hard idle and start when the engine is warm but when its been sitting overnight and its cold its starts up great and runs like it should. Couple monthes ago I replaced the fuel pump ive changed the plugs and wires and the etc sensor. I have spark on all cylinders but the driver side cylinder closest to the firewall has spark but it doesnt change the way the engine runs when its unplugged or not. Also sometimes it gets a wierd popping noise in the exhaust and has some liquid spatter coming out of the exhaust. The gas mileage is HORRIBLE I need to know whats wrong with it so I dont tear all the accesories and the whole top half of the motor off for no reason PLEASE HELP. Thanks
have the same problem?
Wednesday, March 9th, 2011 AT 12:36 AM