Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Quadrajet on stock 350 idles fine drives like junk
View Single Post
  #9 (permalink)  
Old 03-14-2010, 11:19 AM
cobalt327's Avatar
cobalt327 cobalt327 is offline
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Posts: 5,031
Wiki Edits: 1616

Thanks: 128
Thanked 616 Times in 565 Posts
Originally Posted by DQ81
Timing is fine, vac advance works fine.

8 BTDC, all in around 2.8k RPM @ 36 degrees.

This makes sense as like I said earlier:

If the truck idels a few minutes, punch it and accelerate moderately or WOT it's just fine for about 7 seconds and then stumbles almost completely stalls, let off the gas it recovers but if gas is re-applied it surges and won't accelerate or hold a speed properly.

The longer I stay off the gas the longer I can accelerate afterwards but it's back to surging pretty quickly. Timing isn't going to effect this.

It's a factory mechanical quadrajet with the correct timing.

What's next?
This is sounding like a fuel delivery problem.

See my reply above re the filter. There might also be an inline filter that has been added at some point- it too will need checked/replaced if needed.

The pump might be on its way out.
Reply With Quote