I just bought a 1992 flareside f150 4.9 strait 6 auto

I was told the truck ran fine with the propane conversion kit,

Ive took out the propane kit,

The truck has problems starting up cold, starting fluid is needed,

once warmed up she starts just fine on her own, the truck smokes from the tailpipe black smoke and it leaves a huge black spot on the concrete,

When I put her in gear she stalls, when I rev her up she misses, I couldnt even pull her up on the trailer she would bog down,

I have

Checked timing
Replaced Spark plugs, FPR, ACT sensor, MAP sensor, ECT sensor

she still smoking black and leaves a residu on the concrete, Im pretty sure its not oil,

Any Ideas,

I want to run her on gas only,

thanks

 

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Propane hook-up

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Please post in the pre-1997 forum - you don't have a V-6, it's an inline 6.

 

oops
sorry
thanks