My pajero io 1.8 gdi 4g93 model h76w efi. has a hardstart idlin unstable when warm it drops from 850 and eventuanlly it goes off what could be the problem

NO YEAR TOLD
NO VIN TOLD
NO COUNTRY TOLD (EFFECTS EFI THIS)
throttle pedal (engine ) is weak or transmission slip. tests prove this.
there are 6 variants of this engine.
no transmission told ,make,model. not even STICK or AUTO tranny

The 4G93 is a 1.8 L (1,834 cc) engine available in both SOHC and DOHC versions. Turbocharged variants are also produced. In mid 1996 Mitsubishi released a gasoline direct injection (GDI) version of the 4G93. This GDI model saw a production of over a million units though it was a heavy polluter therefore only sold in the Japanese market. A partially cleaned up version (with less power) was later sold in Europe, and was among the first of the modern GDI engines. It brought good fuel economy and, if well serviced, long engine life.

You can try a fuel injector cleaner or flushing the system both available here at Presley's Service Centre and it may just turn off your Check Engine light. ... A faulty sensor will also make the Check Engine light turn on.

https://www.presleysauto.com/check-engine-light/

z116

Check the spark if you have fuel pressure ,all the best.

online manual here Mitsubishi 4G9 User Manual

Replace the air filter and IAC idler air control valve.

Why worry about reference numbers, the parts house should be able to work it out from your vehicle details. Same for the dealer.

Most likely a worn throttle censer.

idle air control valve or your fact idle valve is not working properly, all two of these are housed in the throttle body.You can try cleaning the throttle body firet if it dont work you knpw what to do. Good luck.

sounds like the cabbruter is losing pressure cheak tubes may be lose or damaged