my car cutting out

[tys]

i have just changed the engine in my e30 from a 2litre to a 2.5 the problem i am now getting is that whenever i go into high revs the engine dies, could this be due to the fact that the ecu i am running is the one off the 2litre. i have the ecu off the 2.5 so changing them wouldnt be a problem. please can someone help me as its driving me mad thanks

[dazleeds]

id say change it cos fueling will be different on the 2.5 id imagine

also is the 2litr head any good?for sale? Daz

[tys]

thanks for your reply, sorry sold the engine before it was out of the car