Thread: 1997 gtp sometimes only hits 4k rpm

Yes ill rev it in park,only wen i notice the rpm will kind of jump to 1200k.....i always let the engine warm up a bit befor i drive off
then wen its been running for about 20 mins ill hit the gas(not flooring it) just enuf for the boost to kick in and it will only get 1 or two bars
KIND OF A HESITATION LIKE THE SUPERCHARGER WANTS TO KICK IN BUT WONT