Engine Performance problem
2002 Chevy Avalanche V8 Four Wheel Drive Automatic 113000 miles
My 2002 Avalanche with 113,000 miles on it has a problem with a very rough start up during cold weather (below 40 degrees). It bucks and jumps and surges and misses for about 5-7 minutes. Once it is warmed up it seems to run fine. The engine light does not come on. For these vehicles and engines I have read that it could be a manifold leak, a faulty gas pump, an air throttle valve problem or using 10% ethanol fuel. I have yet to take it to a repair shop. I am curious as to what the real problem might be since this problem seems to be fairly common.