My issues.... well where to start when you buy a cheap MR2...
Trying to fault find for rough idling and general lack of performance issues when driving (intermittently).
Checked basics for boost leaks, cleaned throttle body, full service and checked timing.
Checked ECU inputs that assist to calculate fuel; Check AFM and set factory screw. TPS replaced.
Found TPS wiring broken when replacing TPS, wires were hard, outer crumbling, wire broken / not in connector. Got a new TPS Plug and wires from the USA (cheap - sellers on ebay - Toyota TPS Plug).