Engine cutting out during hard acceleration.

[Ecmeric]

Looking for help identifying possible causes. Car cuts out during hard acceleration. Feels like you are hitting a hard revlimiter. Searching forum, I changed the spark plugs with NGK tr6 gapped to .028". Still does it, and now even stumbles occasionally during normal driving. Feels to me like the ignition is cutting out for a split second. Looking at the collective experience for guidance.
Thanks
Eric

[doug_porsche]

Fuel pressure? Check the fuel filter?

is this a long term issue (ecu tune?). Something that just started?

[Ecmeric]

This is something new. Doesn't do it when I drive softly.a It feels electrical, because the power cuts out very abruptly for a split second then power comes back for a split second and repeat. I push in clutch and get off gas and car stops bucking.

[Supercar Sensation]

Check the Coil packs to look for a bad one. Get an ohm meter and compare all the values at the terminals. Check your wiring to the coil packs as well by checking ohms on each terminal. I found a short in one of my coil wires by this method when I had the same cutting out under WOT. You can also decrease your plug gap to 0.025". Good luck.

[Zeitronix]

Coils rarely fail. Plugs first, wiring second to check. Boost kills spark.

[ken7258]

What are your coil gaps? .026 - .028 for boosted engines.

[doug_porsche]

Coil gap or spark plug gap?

[ken7258]

spark plug

[waldek22]

Check the Coil packs to look for a bad one. Get an ohm meter and compare all the values at the terminals. Check your wiring to the coil packs as well by checking ohms on each terminal. I found a short in one of my coil wires by this method when I had the same cutting out under WOT. You can also decrease your plug gap to 0.025". Good luck.

I had the same problem , 3 of the coil packs were different manufacture ( they were not defective ) , but the car would buck under hard acceleration.

[Ecmeric]

Figured I'd let everyone know what the ultimate outcome was. It was a failing fuel pump.