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I am the original owner with 200k + miles. Never any major problems until now

drove from Pa to Fl empty got 19 mpg
came back pulling a U haul trl and got 14 mpg ran great !! no issues at all
got home parked truck and unloaded back seat truck sat appx 30 min when I went to move it hard start with lots of white/ dirty smoke ( LOTS)
and mass loss of power .. could barely get truck into my garage 20' away.. Thinking its a fuel issue I visually inspected fuel lines for leaks/ rust all look good engine code for a Mass air flow, replaced MAF code gone no change in problem,, cleaned and inspected filter housing,, found a small amount of fuel at base of primer pump cap ( barley noticeable maybe 1 or 2 drops nothing more ) I have a new primer/ heater assy on order but have great doubts this is problem ... any suggestions or input would be greatly appreciated
Thanks Karl
 

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I think what you have done or will do is likely to solve your problem. If not, use your scan tool to make sure the MAF signal is correct for the circumstance and not jumping around or non-existent. I hope yo bought an OEM MAF sensor.
 
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