150 psi in all all four cylinders cant be normal...stock gsr, runs and drives perfect except for the low idle.

 

The important thing is that they're all consistant.

 

thats what i got in the ls b18a

 

make sure the car is fully warmed up and you have the throttle plate fully open when cranking it over.

I made both those mistakes on my DSM when doing the compression test, but my friend said the same as above. "The more important thing is that they are all consistant"

 

The compression gauge can significantly affect the magnitude of the numbers. Consistency in the key.

 

I would agree that more likely then not, your engine is fine.

 

thanks, but as far the 100rpm idle Im still stumped