I have 97 chevy blazer that skips when it wants too. Sometimes it will skip for about 5-10 mins as soon as a crank it up and sometimes it only skips when i get it up to about 40 mph but other times it wont skip all day long but still sometimes it will skip all day long. The plugs are brand new.I havnt got around to changing wires but a couple people say it could be the mass air flow sensor but im not sure.

Any suggestions would be much appreciated .Thanks