I own a 2003 GM GS I have never had no problems at all but regular maintance. right now it's clocking 128,000 miles all I had ever change on this car it's the alternator and I'm about to change the water pump just 'cause I beleave it's about time but for some reason today 9/5/07 the "Check Engine" light came on now this came out of left field unspected. I keep my maintance on schedule I don't know if this have nothing to do with me taking off the tube that takes in the air to the air filter box. can anybody help me please I will appreciate any help thank you.