Been havin trouble with a mates car it holds back at 4k and its doing my head in.

Checked all loom fitted new connectors on 90% of it bleeped out all wires and ohms check.

New sensors
correctly gapped tps
as above with all phase and crank
tried changing ign amp. leads plugs ecu.fuel pump,pressure reg

BUT its intermittant
if you drive steady its fine all the way any ideas to try

People who know me no im not stupid but this issue is pi**ing me off

cheers

Paul