Hey guys, so, my truck has developed a low, rough idle with smoke in every gear but park and neutral. It also accelerates itself in drive through first gear and in reverse. If i'm sitting at idle and it's in drive or reverse and i shift into neutral the truck will rev up to over 3000 RPM and then settle back down into a normal idle. I have a feeling that it may be torque converter related, but i may be wrong and i hope some of you have some insight. thanks in advance!