2001 Saturn sc2 high idle in park and in gear, what's wrong?

Asked by Oct 23, 2016 at 07:35 PM about the 2001 Saturn S-Series 3 Dr SC2 Coupe

Question type: Maintenance & Repair

I've been having problems with my 2001 saturn sc2. It idles high in park
and in gear after the engine is warmed up. Before the engine is warm it
idles right but it sputters a bit, like it's about to stall and does so
occasionally in reverse. When the engine is warm, in gear it idles at 1200-
1300rpm, and when i put it in park it revs all the way up to 2500-3500 rpm.
The engine also misfires frequently under acceleration, except for very
hard acceleration. So far, I've replaced the AIC, TPS, spark plugs, heated
O2 sensor (on the exhaust manifold, not the one by the catalytic converter)
and the fuel pressure injector regulator. All replacement parts were OEM
and none of it has helped. When I hooked it up to the computer the error
codes I got were P0122 P0507 and P0172. The last part i put in was the
Fuel pressure regulator, which required me to disconnect the battery. Since
then, the car still has the same problem but despite that, I have no service
engine light on. Can anyone help me, please? I'm out of ideas about what
could be wrong.

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