OK here it is, I have recently gotton a 2004 chevy silverado with the vortec engine. this truck was abandoned by a prior renter. finally got it cranked and there are a few problems i hoped you guys and gals could help with. 1st: engine idles high..(never idles down) 2nd: when you touch throttle it revs high and takes about 5 sec for it to come back down. this is really weird because you just touch the throttle.... and it goes high like 4k or so.. any ideas? noticed that the odb II jack is not working either.