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Why do people insist on just replacing parts .. with no idea if they are bad or not.
Why not buy a FSN ( Toyota shop manual) and test the it out... refer to the FSN if you are with in specs..
get a good volt meter, fuel pressure gauge , timing light.
pull codes, pull codes
Check for vacuum leaks as this engine is particularly sensitive.
Fuel pump- test the output pressure, test the electrical load at idle or running..
Check fuel pressure at the rail when idle or higher..
TPS - test to make sure you are see proper voltage at certain throttle angles..and no dead spots thru out the range..
Check voltage, dead spots or resistance at the VAFM , door and temp vane.
o2 sensor - test with a volt meter, if reading are slow/wrong or not there , get a new one.
Coolant temp sensor ( if you have one) - check resistance
Cold start injector- is in on when engine is hot..??
Check all electrical grounds
idle control valve ( it goes by many diff names)
etc etc etc
However, this sounds like a sticky door or dead spot in VAFM (vane air flow meter) (usually incorrectly referred to as the MAF or mass air unit, as this measures volume with the door and temp with the vane.)
In the VAFM there is a potentiometer that tells the ECU the door angle sometimes there are dead spots in the POT coil or an open contact in the circuit board... all of which can be tested with a volt/ ohm meter and a manual ..
Test , refurbish and then replace.. dont be a friend to the parts store if you dont have to..
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