Just replaced the ignition switch on my truck, I had the problem with the passlock and waiting the ten minutes, and this forum really helped me out with all of the available info. The day after I replaced the switch I drove the truck to work, no problems. On the way home when I would stop at a light and then try to go, the truck would stumble like it wanted to stall, but it never did. It didn't do this everytime I had to stop, but it got more frequent the longer I drove. When I got home I parked the truck and just let it idle in park, as it sits there the rpms drop to almost zero then they kick back up, idles good for a minute then same thing, rpms drop, the truck never stalls out, the check engine light does not come on. Just had the fuel pump, cap, rotor, wires, and ignition switch replaced. Any ideas? Thanks

 

How long ago was the fuel pump replaced? Yesterday? Last week? Last winter?