Ok...I am in desperate need of troubleshooting wisdom on son's '86 244/230F/LH2.2 of which I have posted about here in the recent past. It has a bad stumble accelerating from a stop and will sometimes die pulling away. Accelerating slowly it is less pronounced. Accelerating more rapidly, the car will surge...surge...surge....surge as it tries to gain speed.

As of today I have replaced the following:
1)main fuel pump (new)
2)main fuel filter (new)
3)engine wiring harness (used)
4)plugs, cap, wires, rotor (new)
5)Ignition wiring harness inspected (looked OK)
6)Fuel pressure regulator (new)
7)ECU replaced(used/this corrected an idle-control problem)
8) Main fuel pump relay (resoldered)

I can hear the intank pump runnning normally. I have a new intank pump and sock which I have not installed yet. Not sure if this is likely candidate but will probably install these next. Funny thing is that when the main filter was replaced last week, the car ran great for about 5 miles but problem then returned. I thought that this might point to main pump, intank pump, sock problems, but main pump replacement made no change.

The engine idles well, but high. I have the base idle set at 740 rpm, but the CIS keeps the idle high at around 950 rpm which is a puzzle. The engine revs freely in park or neutral, only stalling under load while driving.

I checked the AMM with a dwell meter per the Bentley procedure and needed to turn the adjust screw down (plug had already been removed) about 1 1/2 turns to get something like the 20 - 70 dwell reading specified in this procedure. As I mentioned the idle is high, and so I am not sure if this reading is accurate, but it does seem to indicate the the AMM is doing something and is not dead.

I am still not certain if the source of this problem is ignition or fuel. Any suggestions for troubleshooting would be greatly appreciated. I am scratching my head, but will be pounding it against the pavement pretty soon. Please help me save my sanity..........

Regards,

Cliff