Baffled
 

I ran my car at Sonoma and everything was fine. Did a rear gear swap but didn't drive the car till I installed new brake pads.

Problem......car is hesitating under load. I can goose the throttle with car in neutral with no issues but when I drive it and open the secondary's up the car is hesitating under load with slight pops out the exhaust.
So far I have torn the carburetor apart twice, replaced power valve and accelerator pump diaphragm, checked float level, checked and tightened my fuel lines, replaced plug wires, replaced dizzy cap(had a crack in it), and checked a few of the plugs to see if they were fouled.

Not sure if its a lean miss or electronic.

Any other suggestions?

Is your fuel pump putting out enough gph?

It has in the past and has been on the car for 4 years now with no changes to engine. It could be on its way out though.....

Odd thing is that car was running fine at the track a few weeks ago. It sat in the trailer for a few hot days afterwards and then I took it to get a gear swap. Just seems odd that it would do this after running fine at the track.

Just did a coil swap so I can rule that out.

Pull all your plugs and report color or condition.

1,3,5, & 7 look the same. dry and medium charcoal colored. taking five....its gotta be over 100 in my garage

After checking plugs, check distributor, then check plug wires and measure resistance/ohms with meter. Wires should measure very low resistance. Under load a wire that has high resistance will cause similar issue.

You mentioned a gear swap, what did you go from, and to?

Thanks Jay.......looked for my multimeter this morning and couldn't find it. I used it in the house last so it has to be around here somewhere. Wire are new though.

Plugs 2,4,6, & 8 look the same as 1,3,5, & 7.

Went from 3.42's to 3.73's

Checks them wires for cracking and arch marking....how was that bronze gear?

Plug wires are new. I'll pull distributor and check the gear next.