Inlet manifold now won't start!

Hello



I've just done the Inlet on my ZS120 done a real smart job of it cleaned everything with brake cleaner and the engine block with emery cloth used colour coded cable ties so I know everything is plugged back in etc.



Now the car won't start sounds like it's only firing on 1 cylinder so I took out the spark plugs and oh my word what a state all white and corroded!



The coil packs don't aeem they reach far enough for the spark plugs anyone else thought that before?



I'll try new spark plugs and hope that will cure it!

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