It's either your Idle air control valve sticking or your entire throttle body may need replacing,check them both.
SOURCE: Peugeot 206 1999 losing power
its a peugeot, the french are known for many things autos arnt one of them
SOURCE: 1998 Pontiac Grand AM GT motor revs
it would not be an O2 sensor, period, they would never cause a high idle, have u had this checked for trouble codes? A sticking idle speed control air bypass can cause this problem as well as a throttle position sensor, but run the codes, Kragen does it for free was well as other parts stores.
You could have a dirty Fuel Filter, try changing that first since it's the easiest and cheapest to do. You'll find the filter i believe on the inside if the frame under the drivers area. The only other thing i can think of is a fuel Pump going bad and not producing enough fuel pressure.
Best thing, start with the fuel filter and get the truck scanned for any DTC codes.
Good luck and hope this helps.
SOURCE: high Idle in park
I would check for a vaccum leak if there is not then you might suspect the idle air control or the mass air flow, is there a check engine light on
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