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[Jim 3.2]

Hi everyone really need help have a 3.2 omega i changed the low mileage engine over to a better shell the engine was running like a dream until i changed it over now after i start it/it will run perfectly until it warms up then it going off cylinders 1/3and5 have changed coil packs new and  orginal have had compression test done all cylinders are excellent warm and cold have changed  full wirring loom changed lamba sensors had head gasket checked all ok when it goes off the cylinders when warm after about  5 minutes plug it in clear codes when warm then problem appears again after  5 minutes any help will be greatly appreciated have had a lot of different omega men look at it but no one has the answer ready for the matches

[Doctor Gollum]

Is the engines original still attached to the engine?

[henryd]

Is the engines original still attached to the engine?

Original what ?,ECU per chance ?

[Lizzie Zoom]

Is the engines original still attached to the engine?

Original what ?,ECU per chance ?

I think DG is rightly suggesting the OP puts some full stops and commas in the explanation, explains clearly if the original body shell has the original engine still in it or not. I am sorry OP but I am confused as to why you would replace a low mileage 3.2 engine.  Is the low mileage engine still in the original body she'll or has it been placed in another 3.2's shell?

 If not a 3.2 body shell then the electrics will not match the low mileage 3.2 engine and will give you problems that real experts on here will know all about.

I am sorry if I have not understood correctly!

[VXL V6]

What codes are being raised?

[Broomies Mate]

Quite obvious to me;

The OP had a low mileage 3.2 Omega, and used the engine from that vehicle to put in a better shell. 

To further clarify, the low mileage engine ran fine in the original shell.  It is now losing one bank of cylinders.

[Doctor Gollum]

Is the engines original still attached to the engine?

Loom was what I was thinking. Ecu swap will confirm fault in the wiring...

[deviator]

The often over looked earth wires?

[dave the builder]

The often over looked earth wires?

that is a very good point 
poor or missing earth connections cause havoc

[tigers_gonads]

Check you haven't got the 1/3/5 side lambda sensors loom mixed up with the 2/4/6 when refitting 

[Jim 3.2]

Thanks everyone for replying i tried swapping the Ecu made no difference the lamba sensors are definitely correct i am away at the moment when i get back i will take the time and recheck all tha earth wire's

[deviator]

Thanks everyone for replying i tried swapping the Ecu made no difference the lamba sensors are definitely correct i am away at the moment when i get back i will take the time and recheck all tha earth wire's

The quickest way to check is to get the car running lumpy and wrong and then using a jumper cable, directly connect negative terminal on the battery to a good metal place on the engine. If that makes any difference, start the fiddly find the wires.