First I have done everything on the "Dirty Dozen" suggestions forum including changing the three capacitors on the ECU. I have a Grand Cherokee Laredo, 2wd, 4.0L which has had the following replaced. O2, IAC, TPS, MAP sensor. All electoral connections inspected & cleaned. Temp gauge & oil pressure sending unit replaced as well although I don't think they have anything to do with the sudden bucking, and stalling problem.
I did notice if you play with the gas pedal when it tries to stall that it will keep running and not stall. This led me to look a little harder at the TPS (remember it is new). In my poorly written after market manual it has you unplug the TPS and check to see if there is 5v on the two outside connections (ignition must be in the on position). I have 7.3v ? That seemed a we bit high and after turning the ignition switch off I still have 3.2v? Again looking at my poorly written manual I see 12v goes to the ECU and 5v goes to one of the connections on the TPS connector.
Has anyone seen this before? Is this a bad ECU?