My ‘91 F150 is idling rough and lopes at idle sometimes. I pulled the codes with KOEO test and they are 117, 126, 122,112, 327, and 513 which are all related to low voltage. The truck has a 4.9 6cyl. with 130,000 miles.

Any suggestions on what the problem is?

Thanks, Reb

 

It appears your EEC is in need of replacement. BUT, before you replace it , it would be wise to check all solenoids and sensors and circuits for any shorts. Sometimes the ECM gets tired and other times there is a more specific cause for it to quit.