Peculiar Idle...?

[Original_Ranger84]

SO i did the GM 4 prong HEI Duraspark setup on my ranger... and the idle has been kinda funny ever since. It idles fine at whatever for like a few seconds then drops im gonna guess 75 100rpm's idles down there for a few seconds and goes back up to normal and just repeats that...? I have been looking for a vacuum leak or something but nothing has turned up? Is it possibly suposed to go up and down like that? Or what would possibly cause this?

 

[bagdranger]

what carb are you running on the duraspark conversion?

 

[Original_Ranger84]

what carb are you running on the duraspark conversion?

I am not completely positive, the one i got came from another 2.8L ranger and had no tag. I believe its a motorcraft 2150 cause the butterfly flaps fit right in and it looks identical to one on my friends car, but i know there is like a bajillion versions that look similar.

One of my thoughts was that the gasket might be plugging a hole for the carb... ?

 

[bagdranger]

check your base timing I believe it should be bout 12 btdc. I believe if you had a vacuum leak the truck would run rough and maybe not run at all. I came cross a bad vacuum leak yesterday and my truck wouldn't stay running.

 

[Original_Ranger84]

Yep timing has been set at 12 since i did it... it kinda gives me the impression that it has A/C (like when the ac clutch kicks in and the idle goes down a little bit) except the ac is a little sticky. I don't have ac anymore though...