Help. Modis Snap On Scan Car idles fine in back up ECM?

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gidyuppp

Member
Joined
Jun 17, 2010
Messages
129
Just finished installing a new crank sensor and already put in ignition module and coil pack. Car now starts but idles rough and stalls in gear. Hookes up to Modis Snap on sensor and put in back up mode. Idle smoothes out for the two minutes in back up mode. All grounds are secure. All plugs correct. Took ECM out and it is very hot for just the few minutes in idle. I have a TT 93 chip. Is the ECM or Chip bad? Any suggestions? Thanks
 
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