Hi there...I am pretty new to this forum so I didn't know where to put this post but I think I may be right. Anyway my car is a 1987 Camaro.

The stock engine in the was was a LG4 engine...That means 305 computer controlled quadrajet carb engine.

I have always been so excited about those TPI engines. I don't know why I just am. And after a while I wanted to convert my carbed engine to TPI.

The swap went pretty good but know I have some problems with the voltage on the car.

I have a 60A battery that have been factory tested yesterday and it should be good they said. My alternator is also providing power because when I measure the voltage when the engine is running I have about 14.2volts...Varying a little bit..

When engine is off the battery shows about 12.3 to 12.5volts..

My main problem is the ECM and the voltmeter inside the car at the gauges. The voltmeter is reading about 10volts and jumps up and down all the time..2seconds with 13volt and suddenly 3 seconds with 9volts and if I put on the lights i can drop down to 7 and 8 volts on that voltmeter and the idle of the car is getting terrible...after a couple of seconds the volts jumps up to 13 volt again and the car idles fine...

Any ideas of what this could be???...
I have been measuring the voltage around several places in the engine bay. Between battery and alternator...at the inline fuse that goes to ECM...and several other cables and it is reading about 14 when engine running and same as battery when engine is off...
Please give me some hints here..I need every information I can get.