I use to think,that when plugs started missing,its time to change,correct me if wrong.
I know wars have been started here over resistor's and non.
Read something today about that. No change in performance either ones.Matter of fact resistors spark longer than non.If you have computer controlled ignition,non resistor can burn it up.
Case in point, man had motorbike that he ran non resistors in. Bike was fine,the wire burnt up, and he attach what was left directly to plug. ECU burnt in no time,Once he got another he changed to resistor.
Anyways fuel mileage sucks lately,I'm thinking plug time.
Also my car has a MOT valve. It sucks vapor from fuel tank.But I noticed for the first time fuel in the hase. Valve works as I keep it clean.Not running rich.M104.994

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt