That is usually from a clogged catalytic convertor and/or the pre-cat or collector that sits in between the manifold and the cat. If you left the pre-cat on, remove it and see what the result is.
You can also check to make sure substrate from the converter didn't blow into the muffler and plug it.
SOURCE: GrandAm Tranmission shifts hard
I had the same problem in my 2002 grand am GT. After taking it to a transmission shop and them telling me that I had all this stuff wrong with it that was going to cost me about 2700$ I looked elsewhere. I had an Intake Temperature Sensor that had went bad. It was registering on the check engine light after the fact. I changed it and then found out there was a loose wire in the connector. I fixed that and havent had a problem with it since
SOURCE: o2 sensor location 1997 pontiac grand am 2.4 4 cyl auto trans
BANK 1 SENSOR 1 IS THE ONE IN THE EXHAUST MANIFOLD. BANK 2 SENSOR 2 IS BELOW THE CATALYTIC CONVERTER.
P0171 SHOULD GO AWAY WITH A GOOD O2 SENSOR BUT DO CHECK FOR VACUUM LEAKS TO BE SURE. 3.1/3.4L ENGINES HAVE A BAD DESIGN INTAKE MANIFOLD GASKET, THE LEAK OIL, COOLANT, AND AIR.
SOURCE: 1987 pontiac fiero starting problem
the ignition control module goes bad as well. when it goes bad, things like this happen too often in these cars. my car had the same problem. and it didnt work right til i changed the ignition control module which is inside the pick up coil
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