The L67 (2.2 Ecotec) motor you have is known to be a great motor with little to no problems.
Could be something stupid, but until you get it scaned you won't know what it is

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Me
2000 Alero running 14's
2005 Nissan Altima (her's)
1967 Olds 330 motor sitting on a stand
1985 Delta 88 w/1968 350 rocket ( MURDERED )