Starting problem when it gets worm.

Sounds like intake manifold gasket. If it was injector prong it be leaking fuel since it's under pressure. .

My best guess is gonna be a vaccum leak... pick up a cheap can of carb cleaner. Start your car and listen for a whistle or something close. it will probly be near or behind the throttle body. take your carb cleaner and spray it with out the little red hose around the back coner on the driver side of the motor. you can visually inspect the area after you hear an increase the idle. if you dont find it there spray all around any where you see a hose. Hope it helps. a vaccum leak usually wont set a check engine light on OBD 1 cars. Good luck.

I don't have a diagram but I think the replacement carburetor may have come off an engine that had a governor which was activated by a plunger under the distributor plate. The vacuum lines went between the carburetor and distributor. Check to see if there is vacuum at one of the lines when the engine is runnuing. If there is just plug it off. A vacuum leak could be causing your idle problem.

check for a vaccum leak. you can use carb cleaner around the side of the carb and around vaccum lines. if it lowers the idle or kills it `its a vaccum issue easily fixed. could also be low quality fule try running a carb/ fuel injector cleaner through your fuel. if none of these work then id goto a more expensive solution.

spray with starting fluid in the direction of your vaccum leak if engine speed up your are getting close

souns like a vaccum leak take a can of carb cleaner and spray down intake while engine is running if engine races up you have found your vaccun leak then try to tighen intake or fix vaccum hoses

the hubs on that truck are a vaccum controled hub, when the swithch is turned to 4x4 the vaccum control solenoid (on the fender) applys vaccum to the hub and locks- you can put a vaccum gauge on the hubs- if a leak is found thre is an o ring and an axle hub seal that needs to be replaced... if no leak is found at the hubs check the vac. lines and solenoid.goodluck

check out these things EGR valve- Ignition timing- Vaccum leaks damaged valve springs or sticking valve- Vaccum leak at the intake manifold try this website to see if they have your car listed its www.alladatadiy.com if not check out your local library to get your hands on a Haynes repair manual for a Lincoln Town Car i hope i have been some help to you Michigan Man.

Bottom bolts on carb loose. Not the mounting bolts. You have to take carb off to see them on the bottom of the carb.

Check the backside bottom of the carb. there's a vacuum port there. Make sure it's plugged up. How's you timing? Also try rotating distributor back and forth. It may be a timing issue. Not enough or too much.