Is This Possibly A Bad Ground?

[Travlingman]

21 ECT out of range,22 MAP signal out of range, 24 IAT out of range, 67 park neutral circuit fault,KOEO, wont run long enuff to warm it up for the KOER test, ect is new,map is new,iat is new, same codes with my old ect,map and iat sensors, could this possibly be a bad ground? Im pretty sure all grounds are connected and clean but i may have missed one, also id like to thank everyone for the info i have recieved on my other issues, yall have been a big help!!

 

[IMenriched]

21 ECT out of range,22 MAP signal out of range, 24 IAT out of range, 67 park neutral circuit fault,KOEO, wont run long enuff to warm it up for the KOER test, ect is new,map is new,iat is new, same codes with my old ect,map and iat sensors, could this possibly be a bad ground? Im pretty sure all grounds are connected and clean but i may have missed one, also id like to thank everyone for the info i have recieved on my other issues, yall have been a big help!!

yes a bad ground can certainly cause some irratic behavior.
- one on the back of the head for the TFI, passanger side
- one for the coil, passanger side fender, near coil
- one off the battery...it also may go to the frame and engine
- one for the cab to the frame
- one midstream on the upper intake
- should also have one on the engine comupter, passanger side, inside the cab just before the door and behind the kick panel.

seem like you could also have a vacuum leak.

might be a relay that is not providing consistant power either fuel or ignition.

have you tested the tfi (aka ignition module)??