mga sir, help sa 4E-FE ko. just had it tuned up 2 months ago and na-calibrate na ang TPS and tama naman ang timing that fixed the idling problem the engine had.

about a week ago bumalik nanaman ang idling problem and even worse, when running on low speed and rpm, pag nag-try mo bilisan ng konte, bumabagsak ang rpm/speed na parang kinakapos sa hangin/gas o mamamatayan but after mga 2 secs (without removing the foot sa gas pedal) biglang akyat ang RPM. plus, parang nahihirapan sha tumakbo pag hindi natatapakan ng mejo malalim ang pedal, unlike pag normal e kahit light foot lang sa pedal e maganda ang takbo, kahit 1.5k rpm shifting.

checked the hi-ten wires and ok naman, also cleaned the sparks. timing is ok (10 deg BTDC with E1 and TE1 shorted), tire pressure is at 30psi, ok naman when reving at hindi parang lunod on idle.

will check the TPS kung baka nawala sa calibration, and will also replace the ISCV, as well as yung gasket ng throttle body and auxiliary air valve and see what happens.

pwede din kaya madumi/palitin na ang Fuel Filter? or yung mismong Fuel Pump?

any inputs kung ano kaya pwedeng ibang problem?

TIA!