jotary20b

hey just bought a donor car that has a completly standard motor it is auto (not for long) but want to get it running right to sell engine . it has the problem of when u get to 2500rpm under half load it seems to die -feels like an ignition or fuel cut -it will accelerate but just not under any real load -and will do it at any revs when put under load -it recently had a rebuilt motor put in and a new leading coil im wondering if could be something to do with that or a faulty hold button on the auto?-
any help would be much appreciated

Dusted RX

Check the battery. If it doesn't put out enough voltage the fuel pump won't go into high speed.

Sgtblue

iTrader: (16)

It's in limp mode. No fuel or ignition advance unless the manifold is under vacuum. If you've got a boost gauge you can confirm.