Acceleration judder

[93_Clubman]

Could be the usual NB8A coilpack wiring loom weakness, ie a lack of support to the wiring where it bends near the coilpacks results in wires breaking inside the plastic insulation. To check for this, after a decent drive, with vehicle idling, move the wiring loom in this area - if you get a variation or stumble in idle revs then some of the wiring could be on the way out.
Gasket should stop oil getting into any of the cylinders, if not then redo.

[Jdown79]

I got it back from the mechanics today, they found literally nothing wrong. clearly theres still a problem though.
Whats next?

[93_Clubman]

Was the coilpack wiring loom issue above checked?

Most common problem items on the NB8A tend to be:
coilpack (usually just one of the pair);
EGI relay;
cam angle sensor;
crank angle sensor;
weakened wires in wiring loom near coilpack due to being bent without support; &
ECU (usually if affected by mositure).

engine basic trouble shooting.pdf

basic trouble shooting.pdf

[speed]

Guys, Could a dying CAS be the culprit?

No! CAS can be effected by heat but generally results in the car cranking but not starting. Won't affect idle.

[Jdown79]

Ok guys, met another mx5 owner, and he said to just replace the fuel pump and,
happy days! All problems solved.