i have the 2.8 and i had a new gm long block and i dunno seem to high ldle in park and N, but in drive its about 1,500 rpms but i did the timming and every thing im maybe thinking theres a intake leak ihavnt tried spraying starting fluid in the TB while its running yet to see if it has a higher idle but any one have that problem yet i mean i only have 5,000 miles on it unless its a cracked intake?? or plenum whatca guys think most common would proly be the gaskets being a 2.8 right i know they always have gasket leak..??