Engine Performance problem
2002 Vauxhall Zafira Two Wheel Drive Manual 85000 miles
bought a 52 plate vauxhall for the family and had no problems with it at all. Suddenly this year we've had a radiator leak (used rad weld) however everytime we try to do 40mph or 3000 revs (or multiple short journeys in a short period of time) - it pulls back and then cuts out as you slow down. Starts again soon but can; t do any long journeys. Had the coil pack changed and its been on the diagnostic computer but it showing no faults (when there obviously is). Every mechanic says that it'll cost a fortune to try everything it could be. Any idea's where to start?