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Damn..not good to hear TPS cleaning didn't help.

Boost hunting or yoyo effect on zd30 crd is a factory normal effect.
Needles and Dawes valves give it a linear smooth Boost curve.

Sent from...

This is how mine went ...
First time it failed and popped that code was just taking off at a set of lights then lost nearly ALL throttle, engine light came up, turned motor off then on and it was...

Maybe air trap.

FWIW

For me, previous fuel filter changes have had no problems, but the last filter change, the primer bulb would not come up firm. Was cranking with main battery and was...

As mudski says plenty on there.

Have a look at link: Check for both from one supplier(postage) if relevant. Should no need new gasket, may at exhaust manifold(genuine)_
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