Not there that I know of in low range, not tested it above 40mph though!

Sorry for the delay. It's a GEMS, 4.6l petrol automatic 1996. I suppose you could describe it as a missfire but wouldn't that be at wouldn't that be at all speeds? All the plugs and leads were changed recently. Its odd because if kept in manual 3rd gear it doesn't happen but in auto over 40 it...

Ah good, thatll save on the old fuel bill. I was going to take him in for diagnosis but wonderd if I could get a heads up before I do. Air filter is newish, not checked MAF sensor

Hi there, New to this site and hope its the correct place to post but wonder if anybody has any ideas on my P38 driving above 40mph problem. Idles fine and accelerates up until 40mph great but after that it starts to ''jolt'. This happens above 40mph through acceleration and constant speed but...