2000 GMC Safari 6 cyl Two Wheel Drive Automatic 189000 miles
Hello all, my vehicle has been running rough for 2 days. What I mean about rough is that it's burning rich, idles rough(about to stall at times)and the gas milage has been horrrible. An engine diagnosis came back as 'cylinder misfire'. I was told it required a tune-up, so I replaced the wires, plugs, rotor, distributor cap and fuel filter. Needless to say the vehicle ran exactly the same way, no change at all. I brought the vehicle to another shop they diagnosed it as a 'faulty sensor, so they replaced the EGR valve and still continue to have the same problem. I have spent over $700.00 up to date and have made no improvements whats so ever. The next step that is about to take place is to determine whether the mass flow senor is faulty. If there is any other solution to repair this could you please get back to me as I would appreciate any information.
P.S - I had this problem last winter and I managed to get through the season, come spring the vehicle started running great again and was fine all summer and fall, now it's winter and it's starting all over again. It almost appears as if the cold or damp weather has an impact on the situation.
Thank you in advance for any help that can be given.
Wednesday, December 12th, 2007 AT 6:58 PM