new supra owner. with some problems
 

Just bought an 89 7mge and i'm having idleing problems. when i start the car it'll idle starting at around 850 and shoot up to 3000 rpms at a steady rythm. any suggestions?

It is supposed to iddle at 800 rpm.
So no wories there !

I'm trying to figure out why its going back and forth between 800 and 3000

Check you vacuum lines first, theres a thread here somewhere showing you all the vacuum line locations. Then you want to check the timing. After that check your TPS to make sure it's still operational and sitting in the right position. Check the TPS screw as well and make sure it's not twisted up too high. Lastly check your ISCV. Just pinch it a bit see if it brings down the engine rpm a bit. Doesn't mean it's the ISCV, it's just to see how the engine reacts.

Also try to check if the MAF sensor is wired.
When you drive it is all ok?

I haven't driven it yet i picked it up for $500 about a month ago. It's in great shape except for the idling. I'm checking the vacuum lines and replacing the ones that need replaced this weekend. There's also a few sensors that that look like they need replaced too. Hopefully I'll have it running right by the end of the weekend. I'll keep you guys updated thanks for the help.