car stall when coming to a stop

i just put a new speedometer cable and a vss sensor in for my maf swap about 2 weeks ago...drove the car for 2 weeks before i changed the computer and everything over...the car would sometimes almost come to a stall when coming to a fast stop until i put the vss and cable in....this weekend i finished up the maf install everything is working fine but now it wants to stall again when you are coming to a stop...i think it is idiling pretty low (about 630 rpms) before i did the swap it idled at about 780-820 and it was fine...i have a new iac valve..so i am going to turn the idle up a bit and recheck the tps sensor.....any help would be greatly appreciated...thanks

just went out and turned the idle up to about 900-950 and turned the timing back to 13 deg..seems like it running alot better. Does anyone know if the mass air make a difference over the speed density from just swapping over just the mass air?

all those wires for the vss and the fuel relay thing under the seat are hooked up, i think after i did the mass air conversion it lowered my idle a little, i have been driving around all day and after driving the car for a while the idle is down to about 780-800 which is right where it was before i did the conversion. so the car is running great now and it doesent want to stall when i come to a stop anymore. i followed the instructions that i got from stangnet too a tee, soldered all the wires and did the vss and the fuel relay thing that way if somthing wasnt right i knew it wasnt going to be either of those cause i triple checked them.