1997 chevy cheyenne 2500

my pick up takes about 20 cranks just to start, when it started the rpm’s shot up 5000 then it decreased between 2500 to 3000 rpm;s. then it shoots up to 5000rpm decreasing to 2500 rmp before shutting off. what could be the problem. it also shakes at 2500rmps????

1 thought on “1997 chevy cheyenne 2500”

  1. The most common reason for a high idle is a vacuum leak. This would also make it difficult to start as it would be getting too much air on start up due to the leak. You will need to have the vacuum leak repaired to correct this issue.

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