hi am wondering if any1 can help me. my vectra 1.8ls 53 plate has seemed to develop an accelerating problem. it happened whilst i was havin alittle frisk with another vectra i took it to 5500rpm in 3rd gear and noticed a load of smoke coming out of the back end? since then there has been no smoke but the car seems to be really flat and will not accelerate like it shud? I parked the car on me drive and left it for a few hours, when it eventually started it was like it was running on three cyclinders but sorted it self out after a few mins. If i drive the car normal (sunday drivin) it seem ok, theres no warning lights on the dash neither. can any1 help me please cheers paul