2000 5.9 dakota - when I start it in the morning, if I put it into gear right away (after the initial high idle - 3-5 seconds), the RPM's drop to almost null, and then they surge to about 1500. Sometimes the RPM's drop enough that I stall out. If I let the truck idle for a good 20-30 seconds before putting it into gear I usually don't have the pblm. . . i know i know. . . if waiting 30 seconds prevents the problem, then problem solved. . .but it didn't do it when I bought in 2001. And it only occurs in the morning - maybe it's not a morning truck :-) - when I leave work in the afternoon, I can start it up, and put it into gear right away.

and also, my girlfriends 91 honda accord has just started doing it.



I throw a bottle of STP injector cleaner in the tank at every oil change (2000-2500 miles).

is this just an idle control pblm?

 

It could be. Did you get gas at the same station?

Any trouble codes? Run by Autozone and have them scan it to be sure.