Jerky acceleration at WOT
 

Went out today for a drive in my classic WRX and I noticed that past 3500rpm it would suddenly stop accelerating, slamming me forward, then start again slamming me back, it would do this until I changed up.

However it doesn't do this when you accelerate gradually, so at first I thought it was traction control kicking in because it was a wet day. But then I was informed classic imprezas don't have traction control.

What could it be?

Which year classic (saloon or wagon?) any modifications?

Tony:)

1995 classic saloon WRX. Larger injectors, Turboback exhaust and remap.

Been told it's probably the spark plugs.

Definitely worth checking the plugs and leads first

felt like it wasn't making as much power as usual too

Sudden loss of power whilst at WOT could be overboost, have a good look over your boost pipework between the turbo compressor oulet, wastegate and boost control solenoid for any splits or detached pipes etc.

Cheers Iain

Edit: ignore that post lol it was the radiator overflow tank.