Hi people. Searched high and low on older threads but no specific answers. Its standard just remapped with greddy profec 2 boost controller. Just driving my car mostly on motorway, nice and warm weather, boosting to 1bar max when I need to overtake, nothing aggressive. Suddenly lost half the power. Exhaust temp gauge on cylinder 2 went cold. Scanner read random missfire. After restarting its been fine.
Since then ive had it forged. Balance shaft deleted, crank balanced. EGR valve taken out. 750cc injectors. Hardwired walbro. FPR. loads off solenoids and vacum lines been deleted. Uprated exhaust manifold, with the exhaust temp sensor in the third cylinder after finding that runs the hottest. Run the engine in. Got it geeked mapped.

Now went for a little road trip driving the same as i explained before. Same thing happenas last time . Managment light come on, restarted the car on the hard shoulder. Everything was normal again. Management light whent out too. I had no scanner with me to check the code. Also the exhaust temp went cold on cylinder 3. Been running normal since. But scared to boost anymore.

Any ideas anyone. This is a mystery to me

http://i1199.photobucket.com/albums/...k/5bd6079b.jpg


Just took the plugs out. Cylinder 1 is the left and cylinder 4 is the right.
Cylinder 4 looks like its running lean not as much carbon buildup as the other 3 plugs i use the car evryday the heat range is ngk8 Plugs have been in car for 1000miles need help to solve this problem i think i might kill my cat