E30 Zone

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

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

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