What would make a 1993 Lincoln mark viii hesitate studder or mis while both idling and acceleration?

During acceleration? I'm not sure. But when both idling and acceleration the engine's combustion can cause a lot of vibration in the steering wheel if you are in an older vehicle. ...

A bad PCV can cause the engine to be pressurized internally, thus forcing oil out of important seals. This can cause a white/blue smoke from your tailpipe when the oil is then burned. A clogged PCV will also cause the engine to loop while idling, and possibly hesitate under acceleration. ...

NO it makes no difference.

A miss, black smoke and a strong gas smell. Also, bad acceleration, rough idling, and stalling. ...

Check throttle plate in throttle body throat - may be stuck open

yes and try cleaning the throttle body assembly if you haven't already

Yuo have a bad aux water pump about $150 at the dealer :) Danny K

This may help but it is only a suggestion. If its a manual the idling may be too low. If it controlled by computer this is an area that may need investigation. ...

my idling on my 2001 ford focus is not idling correct, tried to adjust idling but there is no screw or way to adjust why? ...

Any number of things: Bad spark plugs, dirty fuel filter, dirty injectors, and on, and on, and on. ...

It's not a part, there are parts... First of ECU, then EGR valve, idle control valve, MAP sensor, oxygen sensor. ...

maybe the carburator I had this problem on my 97 lincoln town car, turned out to be s crack in my intake manifold. once it was fixed..no problem. ...

Because even idling engines use fuel.

2004 chevy cavalier is idling to high

Your 1994 Ford Probe sounds as if it needs a tune-up. The reason for the rough idling and poor acceleration could also be very old motor oil, a very dirty air filter, or clogged fuel lines. It is best to bring the car in for service. ...

I sat in my car in the driveway with the car idling, waiting for the kids to come out. ...

muffler or exhaust could be damaged....if it has aftermarket exhaust it will sound different since it is not a V8. ...

No. But it may settle out of higher passages and leave air bubbles. These will go away with a short idling time and gentle acceleration on the first use. ...

change the mass air flow senser

water in the fuel can cause an idling motor to sputter and/or die.

Even if you have the car idling to keep the heater working you are inefficient as the majority of the heat is being removed from the coolant by the radiator not the heater ...

I'd be suspicious of the TPS but that should show as a computer diagnostic code. Run a code scan first. ...

There won't be any vacuum to the egr while idling. Engine must be warmed up and under acceleration or cruising before vacuum opens egr valve. ...

No, they will not. Only in the event of out-game idling would they do that. ...

The most common cause for an engine to die out, while idling, is the idle speed is set to low. You can adjust the idle speed with the fuel injector vital screw. ...