misterbee

Hello, I am having a transmission issue, when engine is cold, it goes into forward or reverse, and revs fine, ( currently just parked up outside house )However when engine has been running for 10 mins and engine is warmed sufficiently, it still revs fine but only in N neutral and P park, put it in D drive or R reverse and engine will only idle, no power at all, switch back to neutral or park and it revs ok, any ideas greatly appreciated, thanks Brian