Just bought a 1999 astra 1.4LS 16v from my mechanic. Car ran great for 4days then started chugging and cutting out. Its been services and sailed through its mot before the problem began. Engine managment light came on and was diagnosed as low power? found a broken wire in the loom. ran great for 2hours then broke down again. Got a tow from roadside recovery he said it was a fuel pump problem. got it back to the mechanic got it on the diagnostics again, the auto spark shook the loom about then it fired up no prob. he fitted a new loom, just got it back ran it for 20 miles and its started chugging again. Now i know you will say get a new mechanic, but the guy is good hes not charging a penny for any diagnostics or the loom but my son uses this car and i think he will commit suicide if we dont fix it..Help please..any suggestions???