My 1990 Town Car, which I love (I'm a fan of big, old, floaty boats), is very close to hitting 180,000 on the stock motor. It stil runs very well, and I average about 21mpg on the freeway (not bad, considering it's an old 5.0 lugging around over 4000lbs.) Anyways, there is a problem somewhere in the engine, and I suspect it is a sensor of some sort. It's a Speed Density FI 5.0 non-HO. The problem is this: when I come to a stop at a stoplight or stop sign, or when I'm cruising on the freeway and let off the gas for more than a second or so, the engine begins to stutter and stammer, and unless I throw the car in neutral, it will stall out. If the car is off, and I turn the engine over, the car will idle without a problem, but if I am driving, and the engine goes from load to idle without going into neutral first, the stalling issue pops up. It's been a while since I was a 5.0 FI expert, but I know that there are a few idle sensor (Idle Air Control or something like that) that might be the culprit. Any suggestions? I don't want to take it to a mechanic if it's a sensor that I can fix. Thanks!