Weird Misfire 1996 Mark

txbear

Registered
1st gen with only 75K miles started to misfire at low rpm (1200-1400) under load. No code, no engine light. Only happens when car is warm so smooth as silk for 1st 5 miles or so. Tried to simulate condition in driveway by putting in reverse applying brake and running the revs up. Car said "Nope, not gonna misfire cause ya want me to." So knowing it never had a tune up this is what I have done:

Replaced plugs and wires (Motorcraft)- No Change
Replaced Coils (MSD)- No Change
Replaced fuel filter (Motorcraft)- No Change
Replaced Fuel pump (Walbro)- No Change... well she does start quicker
Cleaned MAF sensor- No Change
Replaced air filter (Motorcraft)- No Change
Poured a butt load of Sea Foam in tank- No Change... bet my engine is super clean now.
Only use premium gas

If ya punch it she runs like a raped ape, highway speed is smooth and steady, this car only hacks up fur balls when you drive slow ~30-45 mph. I'm at my wits end, hopefully someone has a magic fairy wand and can wave it over my car. Suggestions would be marvelous, solution would be awesome! Thanks in advance for any help.

Bear
 
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