No idle after duraspark conversion.

[chickhauler]

Did you check the egr and make sure it is not leaking internally, are the brakes working properly, do you have a new PCV valve. It sounds like a vacuum leak somewhere. Use a length of vacuum tubing and put one end up to your ear and search around the base of the carb and the nipple on the back of the egr spacer is easy to miss down below the brake hose from the vacuum tree. You will hear a hissing when you get close to a leak it is also good for isolating exhaust leaks also. Glad it is running better find the vacuum leak and you should be set. Make sure to check the timing and adjust the idle air after you find the leak. If your using a 2100 or 2150 carb is the hole plugged for the choke thermostat htere is a fitting or threaded poet on the section that goes down at a 45 degree angle that is a direct vacuum leak also plug the hole or cap the fitting. Some pics would help.

Thanks again. I was thinking I still had a leak somewhere. I tried the old WD-40 trick where you spray it around and listen to the change of engine speed when it gets sucked into the intake but didn't have any luck with that. I will keep messing with it with what time I do have. I work pretty much from daylight to dark during the week and don't have much time to mess with it on the weekend. I really am thankful for all the help with this. I am determined to get it running better. As far as the pics go I have no idea even where to start on how to do that. lol

 

[kimcrwbr1]

You can just fab up a block off plate for the egr but use a new gasket designed for the heat, if you dont know how old the PCV is change it they are cheap. The vacuum hose is probably the best tool for finding/isolating a vacuum leak. It sounds like your close tho.

 

[enginepaul]

The propellant in WD40 is no longer flammable; you might want try propane to find any leak.
Also check any vac caps - they crack after a while
Double check the spring as mentioned, those butterflies should snap shut when you release the throttle; if not it is springs or binding somewhere.

 

[kimcrwbr1]

I found a new throttle cable I believe it was from LMC truck it was kinna spendy but makes the foot feed nice and smooth. Be careful adding a spring too much is worse than too little harder on the carb itself. I had a carb that worked fine until there was vacuum pressure on the throttle shaft then it would stick real bad and not close down to idle correct or consistent ended up scraping that carb.