I had a 1987 Town Car that did the same thing. I went through the same long list of repairs with still no result, I even touched the problem a time or two but didnt fix it because it was too obscure.
Its easier than it looks so bare with me.
On my vehicle the distributer was the problem. Not the cap and rotor but the entire unit. I went to the local junk yard and purchased one for 15$ and installed it myself (if you have no automotive expierience I suggest you talk to someone who knows a little about cars and engines to do this for you). Sure enough the car ran reliably after doing this.
If this is the problem you WILL want to eventually buy a new unit. It was a design flaw in the 5.0 engines *both the HO and the EFI* and mine started acting up about the same mileage.
Rainhopper the Rocker Roo
edit: whats going on and this is just a theory, is that over time the pickup inside of the unit becomes worn or covered in file shavings or just oil and grit and it distorts. Or there is just to much play in the shaft itself. Either way, I'm gunna stake the whole mess on the distributor.
Or a faulty fuel pump.
Has a repair shop been diagnosing all of this? Because this is literally what I went through on my other 87 when it was doing the same thing.
Tuesday, January 16th, 2007 AT 1:39 PM