Thanks for your suggestions everyone, the idle dip/ stalling has been fixed.
After replacing the vdo throttle body
Map sensor
O2 sensor
Surge tank sensor
Coolant temp sensor
Pcv valve
Fuel pressure regulator
Valve adjustment
NGK plugs and leads
As well as air/fuel filters, there was no change, so I tried a used ecu and bingo, fixed.
I was finally confident to have my wildcat 4-2-1 headers fitted with a 2ā exhaust and hi flow cat, and let me tell you, it runs and sounds sweeeeet!
Cannot stop driving it, Iām smiling from ear to ear š
Very glad I persisted in finding the solution, thanks everyone!
4g15 vdo suitable piggyback, Vdo upgrade