im having a problem with the truck idleing when i come to a stop. i just installed l/c dv's. i drove my truck home about 100 miles. when i got to the top of the off ramp to stop at the light my truck started loping really bad. i can drive in the city and it wont do it but if i drive on the highway when i get to the city it will do it. in neutral it will do it at about 1000 rpms. my idle is a little low about 600 rpm does this have anything to do with it? the fuel filter,lift pump,over flow valve are all new. can somebody inform me on whats going on and will it hurt anything? thanks