engine stalls when i stop

[gdrive001]

engine stalls when slowing down

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Hope you guys can help me with this one. This just started happening a few days ago The truck runs and starts fine but when I go to put in gear it stalls the engine. I can get it to go and it drives just fine but when I come to a stop...I have to do it ever so gently because when the transmission switches from second to first gear the engine bogs down and will stall if I stop quickly.
I just replace tranny filter and fluid, the IAC valve a few months back and most recently about one month ago pulled and cleaned the throttle body and replaced plugs and wires. I ran great up untill a few days ago.

Oh yeah.. its a 99 F150 4.6 with 292,000 miles..every thing is stock and it is not throwing any codes at me. Is it possible that the camshaft sensor may be going bad? Or maybe a electrcal power issue,,reason I ask this is because my batty seems a little on the weak side.