[chadnyne]

I have a 1989 K1500 with the 350 V8. My mechanic just replaced the intake manifold gasket as it was leaking oil. I started it today and it started fine. I drove it about 10 miles and stopped for gas, and it barely restarted, like the battery was suddenly weak. Fearing it would not restart, when I was loading an item at the store, I left it running. When I put it into gear it stalled and I had to restart it. It was slow to start again. It ran fine on the way home, held idle at stop lights ok. I put it into reverse to back into the drive and it almost stalled. I gave it gas to keep it running. I plan to replace the battery, but I know my luck and it probably won't be that easy. What else should I check that the mechanic might have messed up during the manifold gasket change? The neg cable appeared secure to the manifold. I'm not sure what else to look for, and if I take it back to the shop and the problem doesn't immediately appear, I'm sure they will send me packing without doing anything. The fuel pump was replaced on the vehicle about a year ago. No other work has been done.