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Re: 1999 Malibu stalling out with codes.
I should have posted this earlier. The EGR valve had stuck open a few years back and since being a non vital function of the engine, I blocked it off with a coke can. Well, I never would have thought of it, but some of my problem was that it had blown a hole in my can. I installed a new can in its place and that didn't solve my problems all the way. I have a Matco scanner. I looked at the frquency of the MAF and it was 1000mhz to high at idle, cleaned it with no improvement. I replaced it, now it is functioning correctly withing range. Still had a little hesitation so I pulled the plug wires from the coil pack just to have a peek. Just as I suspected there was lots of rust. With 150,000 and 11 years on the coil packs, I feel safe replacing them without feeling as I wasted my money. I noticed that the plug wires were original also they they will be replaced also. With all of that, I took the car for a trip around town. Put about 100 miles on it without any problems whatsoever. The car had several problems mostly from lack of maintenance and age. Works fine now.
Jyount, Thanks for the reply and good call on the EGR, that was a good part of the problem, I just overlooked it because I had previously blocked it off. My scanner shows it is open about 28 percent all the time. I generally wouldn't suggest blocking off an EGR valve with a coke can, but it does make a good diagnostic tool. This time I wont be so lazy to forget it and not replace it.
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