Missing issue

[ken5124]

Just took my car on the road for the first ride of the season... Ran good for a mile or 2 then started missing and stumbling on idle.

It was run every few weeks over the winter with no missing issues at all

Edelbrock carb, 318. I can turn the left side idle screw in all the way and it will not drop the idle rpm

I also took some temperature readings at the headers. on the passenger side of the bank 1 cylinder(front) is running at about 195 degrees while the other three on that side 440 or more

One the left side middle 2 cylinders about 220, while outer 2 cylinders r 450 plus.

Plug wires are new last fall.. they are sending spark to the cool cylinders.

I am thinking either gunk in the carb or 3 bad spark plugs??

Help anyone? Thanks

 

[67Dart273]

A non functioning idle screw is ALWAYS an indicator. Either you have gunk in the carb idle circuit, or a vacuum leak, my guess would be the first.

 

[ken5124]

Thanks 67dart That was my first guess. Will disassemble and clean tomorrow then recheck.

Could idle circuit gunk impact certain cylinder header temps?

 

[ken5124]

Found the problem.. small peice of something ?? blocking one of the small tubes at the base on the primary venturi pick up( not sure if I called it the right part)

Cleaned everything out, reassembled and all is once again good in the world!!