I recently had MSDS headers installed on Friday. The car continues to idle quite low (below 500 rpm) during cold start-ups and will sporadically shoot up and down (between 1500 and 250 rpm) while it seems to "hunt" for proper idle. When the car reaches normal operating temperatures, it seems to idle fine, i.e. about 650 rpm, but will sometimes dip to 500 rpm and below. I just checked the installation and everything looks great with no obvious problems. I used new sensors and have other typical mods. to the engine and exhaust, but the car ran fine before installing the headers. No other problems are noted when driving other than at idle and there are no CELs. Any help would be appreciated.
You can be Phil too if you'd like. 
