I just finished putting the rebuilt 4.0 back into my '98 Grand Cherokee & although its not showing a check engine light on the dash when I search for codes it shows a P1388 Auto Shutdown Relay Circuit code. The Jeep starts & runs kind of rough but I figured since its sat for several years & the rebuild engine sat for over a year that'll happen & should get better once driven some. After letting it sit & run its already gotten better than it first was. I drove it around the neighborhood the other night & it did fine. Is the relay the same as the other relays so could some "swapnostics" solve this problem? Should this relay test the same as other relays? Or could the problem be somewhere else besides in the ASD relay itself? Thanks for any help.