....or maybe electrical issue ?
Well, have worked through most of the threads on this section to do with fuelling problems , mis-fires, etc and can't find an exact match for the problems on my '86 GTX.
Car starts fine , hot or cold. All wires are connected including 5th injector. Emissions were spot on at recent MOT.
So the problem is after a cold start, the engine is working fine albeit with a minuscule hunt at idle. Drive off and change through the gears, but at the signs of a hill , where the throttle then needs to be applied, the engine will falter, splutter back fire ! and then die.
Hazard lights ON ! Sit for 30 seconds or so and the engine re-starts ok. Drive off and after maybe a mile or so of normal driving, the same symptom re-appears. Engine by now is fully up to temperature.
Hazards on again deep breath, crank the engine and it fires up ok. Drive off and the whole scenario is repeated down the road another mile or so or at the next hill.
Was thinking fuel starvation maybe ? Have replaced under bonnet fuel filter and checked the recently replaced lift pump and associated filter and they are all fine.
Another symptom is with engine idling , rapidly dabbing on the throttle causes the engine to hesitate and move towards stalling. Release the throttle and most times the engine re-covers.....the back fire is what is puzzling me as that surely indicates fuel getting into the exhaust?
So applying more power causes backfire and loss of engine revs....ignition timing maybe ?
All suggestions gratefully received.