P0400 is an EGR code. Usually caused by carbon blocking some of the the vacuum ports. It can also be caused by a blocked vaccum hose, misrouted hoses, or even a bad ECM
OH YEAH!!!! i have a 1986 sammie blew up the 1.3 and bought a 1994 sidekick. Check out this swap!!!! we took the motor 5 speed tranny and transfer case from the 94 married a sammie t-case to it and put it in my sammie! it has so much power!!! you have to get the wiring harness out of the sidekick to run it and the fuel pump out of the gas tank to make it work. we made all new brackets and mounts. duel t-cases its bad ass!!! need to know more e-mail me at EightySixou812@yahoo.com. I have lots of pics.
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