Misfire following plugs and leads swap

[MackemPete]

Just went to pick my car up after my mates garage fitted new plugs and leads. Car idles fine but had a misfire as soon as you tried to rev it.

He's going to double check the connections tomorrow, however I would have thought a misfire would be felt at idle too? I seem to remember that when I bought the car it spluttered a bit like this and it turned out to be coil packs.

[MackemPete]

It's the perfect idle that has me flummoxed. He's completely going to check the basics as it went in driving OK and came out misfiring.

[MackemPete]

No following good advice on here I went with standard OEM from TVR car parts for the leads.

Plugs were DENSO Iridium Tough Spark Plug [VK20].

I've got my fingers crossed it's just a loose lead. Need her back for a run up to hartside on Sunday.

[MackemPete]

Cars all sorted. They had a couple of leads the wrong way around!

Definitely pulls a lot cleaner with the new plugs and leads. Smoother part throttle running with less surging. Makes it nicer to drive.

[MackemPete]

Sure did. Woke a few people up too:
video