Hello all,
I'm going to be getting a 740 turbo wagon ('89) in a few days. Everything is immaculate on the car but it has a hesitation problem. At idle it will run at normal rpms for a couple minutes then jump up slightly then idle back down. While driving the car there is a hesitation which I think occurs either with or without being on the gas and it almost seems like a jerky kind of cutting out of power, almost like it's missing on a cylinder. Now, that being said, the car has new distributor, wires, plugs, turbo hoses are okay (large one coming from air box was replaced recently), new turbo, new fuel pumps, new coolant temp sensor, new AMM, and new ECU (actually a used one I think), and new Lamba Sond (02 sensor). Oh yeah, and a new timing belt too. The car will continue to run with the hesitation but if it sits at idle it will occasionally die but can be immediately restarted. Also the turbo seems to provide proper boost when called upon too. The only thing possibly pointing to the cause of this is the guy said he slammed on the brakes one day when a lady cut him off and it bogged down and since then has had this intermittent hesitation/stutter. Before that it ran perfectly. So, any ideas? Knock sensor perhaps? Or something more insidious like a loose connection to some other sensor or an improperly grounding something or other? Thanks in advance for any advice.

Matt Campbell