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I picked up this wheeler last week and got a heck of a deal on it but when in drive it would only revv and only move a few feet. Changed the oil and filter and started checking solenoids and connections now it start out of the gate and then start slipping is it is ran more it feels like 2nd and 3rd are not engaged properly I can stop and go back to park revving the motor a few times and start over seems like its not down shifting. No codes motor stout I'm thinking it the ECM but I don't want to chase parts.