I've got my newly rebuilt engine into my car but am having problems getting it to run properly under any sort of load or fast throttle movement and am now getting worried that unless I can sort it soon I won't be able to run the engine in properly.
Maniflow LCB and RC40
MG Metro cam
K&N cone filter (but see below)
Modified MG Metro head with 35.5/30 valves
It starts fine but won't idle below about 1,200 rpm.
In neutral, if the accelerator is pressed sharply it will bog down and stutter before revving up.
When trying to pull away, unless given a bootfull of revs it will stutter and stall.
Once moving, anything more than very gentle acceleration causes revs to drop and cut out.
Once up to constant speed it runs along ok.
Things checked/tried so far:
Put a standard air filter back on. Not much change at all and just makes it harder to adjust the carb.
Blocked off half the surface area on the K&N to restrict airflow. No noticeable difference.
Checked dashpot and needle drop - lifts smoothly and takes about a second to fall back with a light clunk.
Static timed at 6 degrees.
Once it's run in I'm going to take it to a rolling road to get properly set up but at the moment that seems a long way away.
I'm at a complete loss now. I'm sure it's fueling related rather than ignition.