Welcome to the forum!
Do you know if the engine has had its Lower intake manifold gasket swapped out for metal ones? I think that's the major thing when buying a 60 degree GM engine, but that's just me. These cars act weird when that gasket is bad.
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2̶0̶0̶3̶ ̶P̶o̶n̶t̶i̶a̶c̶ ̶G̶r̶a̶n̶d̶ ̶A̶m̶
1994 Olds Cutlass Supreme
2̶0̶0̶2̶ ̶C̶h̶e̶v̶r̶o̶l̶e̶t̶ ̶C̶a̶m̶a̶r̶o̶
1996 Infiniti G20
1993 Chevrolet Lumina Z34
1989 Buick Regal Limited
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