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Not a 1990 its a 1989

(1990 Oldsmobile Cutlass Supreme)
in Wasilla, AK on August 27, 2009
iHAVE POPPING OUT THE AIR INTAKE AND NO POWER ON A FLAT SERFACE GOES GOOD BUT UNDER A LOAD ON A HILL 26 MPH TOPS ??????
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on August 27, 2009
Sounds like your Catalytic Converter may have gone bad, which can be problem on this vintage GM cars. They fail and plug up. Have a shop do a back pressure check. that will answer this question.

Best of Luck!
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on August 28, 2009
thanks dandd
on April 27, 2010
crossed wires and o2 sencer just had this problem popping out the throddel body
on March 30, 2011
our 1990 Cutlass acted the same way. It needed a new catalytic converter.
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