when the timing chain gasket cover was fixed a year ago the cid synchronizer was touch so was left out of alignment my truck at the begininig was fined,,, months after the stalling started ... I did change the IAC clean the egr a moth ago the intake manifild gasket was blown thakns to the forum I was aware of water in the pistons so I stoped my car when I felt that it was stuck
changing the gasket didn't help the stalling I clean all the egr ports that where clogged when I took the intake apart many people like me don't know that the little hole wich the egr its connected to the intake its like a flute long and with more holes than the one that you see
I cange the spark plugs ,set or wires ,newvaccum regulator,new gas filter,clean charcol canister no vaccum leaks disconected the tcc with no luck at the end
the dealer found the cid synchronizer failed so they replaced
onthe invoice said they change a
new stator asy F58Z,12A112,AA
and synchronizer asy F6TZ,12A362<CB
f150 97 150,000 xlt 4.2 V6 extended cab
stalling surging stumblig solved fixed
I hope this helps somebody
M<>M

 

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Thnaks for the tip