2000 GMC Safari

Engine problem
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.
December 12, 2007.

I have had several people on the forums here buy a new coil to find out it wasnt putting out enough amperage!

Dec 19, 2007.
2000 GMC SAFARI VAN - Hi guys, just a quick note, last year the alternator was changed, a 100 amp alternator was used instead of a 105 amp, would this make a difference as far as my problems are concerned. Bare in mind I do have A/C.

Dec 27, 2007.
Hi JUST4NOW, I have been having the exact same problem as yourself. My Safari is AWD, first the Encoder motor went($1200.00) that makes it all wheel drive instead of 2 wheel drive. Then the fuel pump went($800) Then it began stalling and running rough. It then graduated to not starting and having to be towed in, but everytime it got there the mechanic would say it fired right up when it got off the towtruck. Next day it wouldn't start, and when the mechanic passed by on his way home, you guessed it, it fired right up. My mechanic buddy came by and figured out it was the coil. It was arcing across to the manifold when the weather was moist and it always had been raining or damp when my trouble occurred. The EGR was still setting off the computer though so we had it replaced. Fuel economy has dropped off horribly, this van always was a pig on gas but now it has gotten even worse. Now the engine light comes on to say that the Catalityc coverter is cooling down to quick? This van was the most reliable and best vehicle ever, I bet yours was too. Isn't it funny how this problem just started out of the blue? The van runs well enough now and I have learned to tolerate driving with the engine light on, although fuel economy is still horrible.

Dec 27, 2007.
Hey buddy, thanks for your input! The thing is, the ignition coil was just replaced along with plugs/wires. The EGR valve and fuel filter was replaced as well. It goes back to the shop on Monday in hopes they find out what it is. My van is a 2wd so I don't have to worry about the computer mod. Thanks again.

Jan 1, 2008.
Page 2 of 2