Ok I got a greddy kit on my 95 sohc and the boost is spiking causing me to throw a map sensor code. How could I go about adjust the wastegate to try and lower the boost so I can keep it around 6-7 psi max so my map sensor doesn't go nuts. Also my idle is aweful. It sounds like it revs up and down pretty bad.

 

Also if this helps it is running on an open DP at the moment because I don't have the right exhaust yet.