lack of power

Help needed.51 Si 190 Exige Masive battery power drain experianced traced to totaly shot alternator.New alternator fitted And now massive power & missfire from engine when warm. All cencor plugs cleaned but no fix. Advice gladly received.

Leads?

By an S2

Sorry I’ll get my coat…

Does your s1 have a coil ?

If so change it …

could be way off the mark but i had similar symptoms many years ago when the coil got hot it broke down …

Just a thought

Thanks for replys unfortunatly it now will not start either have had to take it to Pat Thomas for help. Will post outcome