I my name is rocky. My blazer is having a missing at idle and I did the inj, plugs ,wires.....I put a new cap and rotor on it drove good for a week and it staarted again...I put a new cap and rotor and it was good for a day and it started again.....I need help I'm had it cheched and it throwing a code miss fireing 4 cyc.......any one plz help thanks

 

*Moved to 2nd Gen Tech*

Have you taken a look at the distributor (actually removed it)? If the new cap/rotor only helps for a short period, I would be looking at a possible distributor issue.

 

Are you using AC Delco parts ???