Lucas flapper AFM 2AM type questions

[Landy 90 Hybrid]

I have a topic in the Defender section, but thought I would put one in here too as most of my Hybrid is RRC. She has a 3.5 EFi, on petrol in, and I have been having some running probs of late. Running lumpy, spluttering when driving, especially when putting foot down. Fine on idle and reving up at stand still. Have done a few checks from the diagnostic manual, downloaded from here, and the results are as follows:

Lucas 2AM AFM

Test 6 - Voltage across resistor wire in AFM potentiometer - should be 1.55v - actual 1.55v

Test 7 - Voltage through AFM potentiometer & the wiring to ECU

Step 1 - should be 4.3v +- 0.2v - actual 4.34v

Step 2 - should be 3.7v +- 0.1v - actual 3.72v

step 3 - should decrease to 1.6v -+ 0.1v - actual 1.66v

Test 8 - Ohms - Check internal resistance of AFM and wiring to ECU

.............actual readings at.....ECU ...AFM Plug.... AFM socket

Pins 6 & 8 - should be 360K - 396K....395K..........395K

Pins 6 & 9 - should be 560K - 616K....614K..........614K

Pins 8 & 9 - should be 200K - 220K....219K..........219K

Test 9 - Voltage at throttle pot

Step 1 - should be 4.3v - actual - 4.3v

Step 2 - should be 0.325 - actual 0.30v (within tolerance)

Step 3 - should be 4.5v MAX - actual 3.78v

Test 10 - Resistance of air temp sensor in AFM

I didnt have a temp probe so couldnt measure the temp, but measured the resistance and was within the scales provided

Given that the voltages are mostly within tolerance, but the internal resistance of the AFM was quite a way out, how would this effect running, does it look like this could be causing me problems?

Thanks in advance for your help

Jonathan