Semi-new to the forums...unfortunately my first post has to do with my boat problem. (1999 454 mag) fuel injected. My idle is sticking @ 3000rpm and tends to stick when you run the motor hard (i.e. pulling a skier or tuber). Previously I could let the boat sit as in letting it cool off and I could manage to get the idle down to 1500rpm which is still too high to engage the transmission. So I read up on the internet and thought I had the problem solved by narrowing the symptons down to what I thought was the problem 1. being the TPS sensor, 2. IAC and 3. maybe a computer module problem. I replaced the TPS and IAC and now I'm stuck on 3000rpm and can't get it to come off of it. I was able to get it back down to 1500rpm by disconnecting my batteries. At this point I have no idea. At normal idle my boat use to run about 700-800ish. I have an appointment with a shop next week that has a diagnostic tool that may be able to help pin point the problem. I was also hoping somebody on the forums may be able to help me pin point the problem. I have to drive 1.5 hours to my nearest merc. shop or should I say they are the nearest to me with a scan tool. Until then, if there are checks I can perform I'm 25minutes from the lake to go see if they work. Funny...I live 25 minutes from the lake, but I have to travel 1.5 hours in the opposite direction to the nearest shop and there is not even a lake in the vicinity of the shop (well 1.5hrs in my direction). Thanks for your help...and again sorry for coming on to this forum with my first post being a PROBLEM.