Quote Originally Posted by 01gpgt01 View Post
Surging idle is common in moded cars. Usually tune related.

It's not really modded that much...3.4 pulley, SLP intake and cat back, MSD wires and Autolite 104's

Bought a retuned PCM by DHP from the pfyc store March of '08

Problems just started recently within the last 2-3 weeks.