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A 0.020 overbore should be within the limits of the ECM pre-programmed map - I doubt that could the issue at hand, but it is possible that it is contributing to a larger problem. With it bored 0.020 over (~0.5mm) - it will still displace about 2.2L. If you bumped it 0.20 over (~5mm), now you have a 2.4L engine with stock ECM - then it would do exactly what you are mentioning here.
How long ago did you rebuild the engine? Did you rebuild the engine in the car or did you pull the engine? Did you put back all the sensors, verified the wiring? Check the obvious - timing, fuel , fire, components bolted back on correctly (intake and exhaust), etc.?
Some stuff that pops into mind after an engine swap or rebuild
- coolant temperature sensor, if it is messed up, will drive the car to a pretty high idle - also affect drivability at part throttle
- air in the block, coolant hadn't completely purged all the air in the block - an air bubble will cause problems that look like a ECT sensor problem
- big vacuum leak somewhere (most likely) - if a gasket curled up on you or shifted, could cause a vacuum leak. Vacuum leaks can cause all sorts of headaches.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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