Okay, I've searched, and done the recommended steps from the forums and peoples youtube videos.
First off, she is a 1990 YJ with a 4.2L, 5spd, and a reman carter carb (dated 2011)
Jeep ran pretty decent until yesterday morning when I accidentally barely bumped the distributor while looking at the orange and purple wires to do the Nutter Bypass.Had issues all day yesterday with idling when pushing on the brakes.
That is where my issues started.
It started running rough and idling funny, so I got out my timing light, followed the instructions and re-set the timing. Seemed to be fine until I drove it down the block and at every stop sign it would die. WTF..
So today I did the Nutter Bypass, followed instructions on doing it and setting the timing to 8*. Ran like a champ. It was awesome for about 2 miles, then same issue. Every time I push in the clutch and push on the brake pedal to stop it idles rough and dies. I have somewhat remedied it by adjusting the throttle stop (center long screw) so that it idles just under 1000rpm, and it isn't currently dying. Still have a slight misfire.
So, what I am noticing though is that when I am pushing on the brakes and the engine rev's are coming down, that is when it goes below idle speed and wants to spit, sputter and die.
Here is what all I did: Today I did the Nutter bypass, replaced the Ignition Control Module to get rid of misfire (didn't work), Replaced the distributor cap & rotor, Replaced spark plugs (didn't work), Replaced ignition coil post connector to remedy misfire as the old terminal connectors were rusty (didn't work),new air filter, plugged open ports on stock air cleaner, got rid of emissions hoses and sensors and plugged all vacuum ports not needed. Just pretty much bare bones carter. I don't have any vacuum leaks.
Only vacuum lines hooked up are for brake booster, distributor timing advance, PCV, and the vacuum to the electric choke. Idles pretty decent in open loop, however a slight misfire. Seems that the misfire gets worse at closed loop.
Still has a misfire somewhere, and have pulled plug wires and it hasn't changed, so perhaps it is in the distributor. Once in closed loop and running above idle while driving, it runs great, however once in a while I can still feel it misfire.
Also, ran through 16.3 gallons of gas in 166 miles, and it ran me out on the side of the highway. So a 1h 45m trip took me 3h 45m to get back to base from the fiance's place.
Eventually I am going to probably swap to a motorcraft 2150 or 2100 with 1.08 venturi's and do the HEI distributor swap. But I don't understand why I am having issues when I am extremely mechanically inclined (went to automotive college, and it was my career for years until I joined the Army).
Thank you for your help.
Jeff