[yruyur]

I installed a new distributor in my 88 Suburban (5.7). I followed the installation procedure (TDC, point roter to #1, etc.) I timed it (I think it's adavnced about 10-12 degrees) and generally speaking, it runs great. However, during cold starts (overnight or several hours) it snorts and jumps and backfires until it warms up a bit and then everything runs smooth. I replaced the coolant sensor and checked for vacum leaks, etc. Everything appears OK. It all started when I replaced the distributor. What the heck did I do wrong? Would being one or two teeth off with the distributor be a problem if it times OK? Help please.