i have 98 civic with dual vtec D15B, the rpm remains stable and gives no problem when the car is idling.
while cruising, as i apply brake with clutch paddle pressed, the rpm drops signifcntly in petrol and the problem is more sever in cng. the rpm drops to zero and i have to start my car again or shift down to a lower gear and then release the clutch and the engine would start again.
i cant use the CNG anywhere in local, just on motorway and that too as far as i dont use the brake.
the assembly is new, spark plugs are new, throttle body is cleaned, air filter is new. tuned my car a hundred times in cng but it doesnt solve the problem at all...................