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[dbug]

For a misfire under load you need to check as said:

Spark plugs

HT leads (condition, and not oil contaminated)

DIS Pack

Note you have swapped a lot of components - therefore you need to check if you are a pot down and the reason why.
First check all plugs sparking ok - remove a plug with HT lead still connected and earth out body of plug (use jump start lead connected to metal plug body and to earth on battery) and crank - if no spark you have found duff pot.

Next need to check if ignition or mechanical - do a compression test on duff cylinder and compare results to others - if compressions all reasonally high and roughly equal  mechanically ok - problem ignition or fuel.

If good sparks on all cylinders and compressions ok suspect fuel (injectors)


HTH

[Cleetus]

Gettin a 19 on paper clip trick would this b anythin to do with it?

[RobG]

Yep, crank sensor

[Cleetus]

Even no it always revs on spot fine just shite under load?

[Cleetus]

Crank sensor now changed no surgin any more just flat as a witches tit top end revs on the spot to about 5000 then fluffs out and dont like also there is a loud hissing noise from engine/exhaust? Any suggestions