My 740 starts to misfire on the hard acceleration, EML light cames on when booting hard and it feels that there is no power at all after engine reaches 5000rpm. I have read the codes:
P1341 Multiple Cylinder Misfire With Fuel Cut-off
P1349 Misfire Cylinder 4 With Fuel Cut-off
P1357 Misfire Cylinder 8 With Fuel Cut-off
P1355 Misfire Cylinder 7 With Fuel Cut-off
P1351 Misfire Cylinder 5 With Fuel Cut-off
Any ideas what could cause the problem ??? I have recently replaced air filter and spark plugs (Bosh super 4); no oil leak on plugs nothing. Thanks for you help.