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Pcm problem or wiring?

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i have a focus that is causing me no end of trouble. 

First didn't idle right and would cut out now and again. 

The intermittent power steering on cold or dam/wet days 

Then all the gauges would fly up and down no power steering, turn it off and started all fine again. Then cut out all together rac called out restarted it.

Had a new battery & alternator. That worked for a week, but engine light was on.

monday loss of power steering while driving, all haywire with the gauges again. Power steering wouldn't come back on. Left it an hour all was fine. 

Next day went to start it all dash lights flashing, multiple malfunctions and it's died. 

Garage are saying it's down to the pcm! But are not 100% sure it will solve the issue

Any advice?? 


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