got a winterazation special at some local kwik kar it included antifreeze flush (prior owner had wrong fluid in) and a intake cleaning system a bottle of something through one of the hoses and spraying out the intake and a additive to the gas. well when the guy finised he test drove my car but he forgot to put one of the lines back on the intake, when he got back from the test drive he put it back on but then when i wasnt in gear my rpms wouold jump from 1000 to 1500 back and forth took it back and he said one of the lines that goes into the intake had a cloged screen ?? when i picked it up it had stopped but know it still occasionally does it again . anyjone have any idea of what is happening here?