Rough idol

[Chevk587]

This may be way too simple but I had a rough idle after letting my truck sit off and on for about two years. After replacing the plugs and wires, it would run fine for the first few minutes but after it warmed up, the rough idle returned. Turned out that I had a fouled PCV valve. Best $4 I spent.

Was it stickey how did you know it was bad ?

 

[BlazerFarm]

Was it stickey how did you know it was bad ?

It wasn't stuck but it was very oily. It was a shot in the dark since I had already done wires and plugs. I figured I'd replace the PCV for $4 before I started replacing the distributor, sensors, etc. I got lucky. I had seem some forum posts online where people were seeing rough idle problems and the PCV fixed it. I guess it was causing a vacuum problem. My shotgun approach to troubleshooting it probably wasn't very scientific.

 

[MikeRose87k5]

Do you have spark right after it dies. Try checking with a screw driver right after it dies.

 

[Chevk587]

Do you have spark right after it dies. Try checking with a screw driver right after it dies.

So update on this issue started it up yesterday morning let it run for 15-20 min with no issue .. Fluke maybe started it up again today let it run for another 20 min still no issue so said what the hell went for a drive she ran great ... No problems Iono gonna drive it to work for a week and see how it goes !