1992 buick roadmaster idle problem
I own a 1992 brickroadmaster and I'm having a
idling problem or at least I believe it is. When the
car sits for around one or two days and I go to
start it, it idles fine and drives fine. Then when the
car has been driven for a minimum of 15 minutes, I
go and park the car and turn it off. After about 10
minutes of it being off when I turn it on, the RPM
needle begins to jump and it feels like the car is
revving itself. It does this for a couple of seconds
and then the service engine light comes on. It does
this everytime the car has been warmed up for a
while and suddenly turned off and on.