1994 Chevy S-10 my s-10 the rpm is moving by itself

1994 CHEVROLET S-10
220,154 MILES • 6 CYL • 2WD • AUTOMATIC
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CHEYENNETHEMAN
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  • 1 POST
my rpm goes up and down, i installed a new pts, installed 2 times to make sure clip connection is good. when the rpm gets above 2000 the check engine light comes on. when i restart its off and rpms still up and down. any advice?
Nov 21, 2008 at 7:26 PM
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LEGITIMATE007
  • CERTIFIED EXPERT
  • 5,121 POSTS
check the throttle position sensor and speed sensor, in that order
Nov 21, 2008 at 7:32 PM