1996 Grand Am Map Sensor, Crank Sensor And Misfire Codes

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Problem on my 1996 Pontiac Grand Am L4, 2.4L; DOHC 16V check engine light codes P0108. Timing belt replaced and water pump and spark plugs.

Question = well when i first bought car it ran fine this all after timing belt replaced and water pump and spark plugs it ran fine for about 2 to 3 mounds and now after i start it the idle goes up an down and when i step on gas it wants to die and when i take my foot off its fine.

I had asked this question a couple days ago when it was showing DTC codes P0108,P0300,P0335 and now only showing P0108 so could it still be timing belt is off a little or something else?

ANSWER:

p0108 is a MAP sensor circuit problem.
P0335 is a crankshaft position sensor circuit problem.
P0300 is misfires.
If all these codes came up after the timing chain was replaced, i would have to say that the timing is off a tooth or two. That would explain the MAP sensor code because the valve timing is off, thus affecting engine vacuum. The crank position sensor would also be affected, as well as causing misfires

The low coolant light is just a stuck sensor in the bottom of the coolant surge tank.