Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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With an idle increase on the engine in some cases this can be due to a vacuum leak on the engine needing located and repaired.This can also cause poor running.If you have not checked over the engine for any vacuum leaks this needs done.If any leaks are found they will need repaired to correct this here.In some cases a smoke machine may be needed to inject smoke into the intake to locate any hard to see leaks like intake gaskets leaking needing replaced.
If this has already been done and found to be o.k. I would have the fuel pump tested to see if it is putting out the correct fuel pressure as well as fuel filter checked to see if it is restricted needing replaced.I have seen both of these cause issues similar to this as well here.
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