My stage 3 4x4 had developed a strange missfire. I start it up in morning no problem. Let heat up, start giving it boost and its fine, doesent miss a beat. I shut it off at tesco or whatever, after 10 mins of shutdown i fire it bk up and its fine. Get round cuple corners, give it boost and it dropes down like a missfire. Only on boost. Drive around for few mins and eventualy goes away. Just put new plugs gapd to .6 in it, new dissy n rottor arm. Not checked gapping on phase sensor or that yet. Very strange its only when shut doen and fired back up.
Stage 3 usual, t34,3 bar map, greens, intercooler, MSD revolution chip, 044 pump with new wiring. Any input wld be apreciated

Cheers Richie