WOT results in Violent Stalling symptoms

[Jordysport]

Got myself a second 172 which i bought just for the engine but want to test the engine properly before putting it in my 182. but getting a Violent judder / stalling symptoms but don't think it stalls when full throttle is applied, its fine on partial throttle. when it does it the lights light up like a christmas tree (i think its that its cutting out and effectively bump starting straight away)

the only fault codes that come up are 301 Brake Pedal Sensor Circuit & 309 Cruise Control/Speed Limiter Brake Pedal Switches.
Any ideas would greatly appreciated

 

[Chrisgti6]

Loose battery terminal?

 

[Jordysport]

Only on WOT though which is odd. terminals are not tight but are tight enough.

 

[Deejuk]

Bad earth, even worse in wet? Mines currently doing exactly the same but haven't had a chance to sort out yet. Check the big ground strap going from chassis to gearbox on the nearside wheel arch and also the connection at the other end of the battery cable...

 

[MicKPM]

Sounds like a misfire - You sure you have the leads on correctly?

 

[McGherkin]

As above, misfire. Mine was old ht leads shorting against the block.