4k RPM Stumble and weird sound Options

[LukeD]

Ok, got my #3 exhaust stud removed and my leak fixed. Cost about $300 clams as I had thought. Now I have a brand new problem, when I hit 4k RPM the car stumbles and has sort of a "clack, clack" sound as long as I am on the gas. Almost as if it's a back fire. I have quite a few parts to swap out if need be but looking for suggestions from those who have had similar problems. It starting doing this right after I picked it up from the shop. It wasn't like this on monday when I dropped it off. Any chance I burned the #3 valve on the way to the shop?

Engine is a 74 2 liter Fuel Injected.

Luke

[LukeD]

!!UPDATE!!

more specific syptoms.

Took the car for a drive and here is what I descovered, all of this is while driving and under a load.

1. I mash the pedal to about 3/4-full in second/third and hold it, when it hits 4k-4.1K RPM its stumbles and makes that faint back fire noise.

2. If I hold the pedal at about 1/2 (or lower) in second/third gear it will slowly make it's way to 4k-4.1k and past that with out stumbling.

I want to think it's the TPS but it only does it past 4k RPM regardless of where the pedal is and therefore regardless of where the TPS is at at that given pedal location. I would assume that if it was the TPS then it would stumble the minute I had the throttle past 1/2 way.

I checked all my connections on the TPS, MPS and Fuel Injectors. I also checked the spark plug wires on both ends. If I unplug the TPS and it runs the same does it rule it out?

THe car runs amazing since the the #2 valve and #3 exhaust leak was fixed. It has great power up until the 4k mark.

Sorta at a loss as to where to start.


LukeD