Best Spark plug for Volkswagen Jetta

I changed the spark plugs in my nieces 2.5L VW Jetta because it was idling at 1300rpm. Rock solid idle at 700rpm afterwards. Easy way to save some gas.

Changing the spark plugs, spark plug wires, ignition coil and the coolant temperature sensor fixed the cold start issue.

My 2017 VW Jetta 1.4 5M - at 67760 miles on the factory original plugs - now has new Bosch Iridium/Plattinum plugs - (YA5KIP80)..................(the only symptom on the old plugs was a MPG drop - no hard starting, no missing, no rough idle......... EZ

NGK BKUR6ET-10, stock number 2397. With every other car I've owned, the first symptom of failing plugs is missing at higher rpms. In the AEG engine, the first symptom is that it gets hard to start. Do you find that too?

I've used Autolite plugs in the 2.0's I've owned for over 20 years now because I think they work the best of the ones I've tried with this engine.

I put a new battery in it. Because it needed one but then I changed the spark blood wires and it now acts like a brand new car, so go to your spark plugs first.

I bought NGK-94833 spark plugs from FCPEuro for my 2015 Jetta with the 1.8T.

I don't use spark plugs like that unless the vehicle specifically specs for them. We used to put Bosch W7DTC's in these, or at a minimum, just the single electrode version.

Just replaced the OEM ones with the NGK PLFER7A8EG 94833 as part of my 40k service on the car. Pretty straightforward like usual except the hard part is maneuvering the coil pack connectors that rest again the intake pipe because of the plastic covering that thing was such a pita. But now the car feels like heavy, like when you put on some heavy wheels on and you can tell the difference right away. I've been having to be so light in the gas pedal because it would fly. Now it feels like I really have to push the pedal a lil harder then usual to pick up speed but it just feels heavy kind of (not sure it's the best description) but it's it not hesitating at all.

I then changed to a hotter plug the Bosch Platinum plugs and again gapped to .28. Once again the plugs fouled shortly after starting and driving for a few minutes.