Service Engine Soon Light Is On

I have a 99 Jimmy that starting missing, when first started it was only in damp weather. Then started stalling when came to a stop, now service engine soon light is on, and truck starting missing at low idle for a minute or two then clkears up, this only happens occasionally!!!!!!!

Welcome to the forum! Advance Auto Parts and Autozone will read the codes for you at no charge. They may suggest a list of parts for you to buy. Write the codes down and post them here. We can determine from the codes what parts may or may not be necessary.