Limp home mode

[Macg]

Hello all. I have a 1994 Silverado 350 TBI. It runs great until you turn on headlights or turn on interior fan then it acts as if it goes into limp home mode, sputtering, lurching, wants to die and have to feather gas to keep it running, drinking gas. Any ideas? Input will greatly be appreciated.

 

[littlemlittle]

Get your battery and alternator tested.

 

[Macg]

Found problem. Was a failing ground wire off battery to fender.