Installed new engine, and got unsolved problems... Options

[Iceman22]

Hi.
This week the workshop finished swapping engine (3s-ge) from a JDM ST202 into mine AT200 (7A-FE). The whole exhaust incl. the cat was also swapped. The new engine only had 80000 miles before the swap.
Almost everything seems too be fine except this:

1. Rough idling and very poor engine performance (feels like 60hp). Engine gets very warm when driving. Also when the engine is cold and I start it, I have to give some gas in the beginning or it will shut down. The muffler is also making abnormal noise.

2. Fuel gauge is showing lowest position and yellow lamp lighting. Before I delivered the car it was showing half tank.


What can be the cause for these problems and where should I start for solving these problems asap?
The ECU hasn't been swapped yet.

And sorry for my bad english..

This post has been edited by Iceman22: Oct 4, 2009 - 11:56 AM

[Bitter]

toyota ECU's are not flashable once they have been programmed at the factory except by special toyota computer systems, even then the 7afe's rev limiter is hard coded via a crystal on the board and not changeable. your 3sge would like to rev higher than 6000 rpm.