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 !!

Ok, new info. I replaced my MPS with know good one, replaced my sparkplugs and cap as the old looked crappy. Problem still persists. However, I have norrowed it down even more.

The car runs good and pulls hard for about 2-5 minutes of driving when the engine is cold. After that it starts to hesitate at at about 3800 and kinda back fires. Car idles fine seems to run fine until I put my foot in it a little. If I give 1/4 throttle it will pull past 4k no prob but as soon as a stomp it it pulls hard all the way to 3800-4k and starts to stumble a bit.

I am out idea's

Maybe my fuel filter is clogged (IMG:http://www.914world.com/bbs2/html/emoticons/blink.gif) maybe my electronic points are going bad? My spark plugs were all sorta white (lean?)



Luke (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif)