i got an 88 na the prob is when i turn on my heat my bitch of a 7 starts to buck and just wont climb in rpms or go anywere.... i turn the heat off it runs and drives fine... wtf ... it dose this when it is cold and when it is hot i have checked for vacume leaks none im lost on this one i can damn near fix anything on her but shes got me stumped on this on any ideas

 

Check that your BAC valve is working properly

 

Sounds a lot like the alternator isn't putting out enough when the heater fan is on, and that in turn is pulling down the battery output to the ECU etc. Like maybe a alternator with a couple of blown diodes.

 

^ Does it happen with the fan on regardless of heater settings? Or can you run the fan full blast as long as the heater is off?

 

heaters are for *****'s

 

ok was working on the 7 today bac is working alt is putting out 14.40 w/o a load w a load its putting out 13.80v

 

not in wisconsin