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OK. I can't decide whether I'm extremely happy or just a complete idiot. I'll go with the happy, this has just been messing with my head for too long. I have found the problem. I did everything that was suggested including touching up the electrical connections, although I didn't end up touching...

Sorry, when you say adjust the throttle screw 'a little bit at a time', do you mean 1/16th of a turn or more like 1/2 a turn? I can't get hold of a scan tool this weekend so I will try without it for now.

Thanks. I will try anything at the moment. I'll have to wait till the weekend again to borrow the scan tool. I am sure I have done something wrong. Could be an injector seal or anything. But why does it work ok with MAF sensor disconnected? I will get to the bottom of it one way or another...

I purchased a new IAC & installed it. No difference. Hoses have been replaced at the back of the plenum. No difference. Disconnect the MAF sensor again. Runs perfectly!!!!! I mean absolutely no sign of any problem. I took it on the expressway for a 30km run and it runs like a dream. Does anyone...

Thank You. Excuse my ignorance but are you talking about the regulator valve on the fuel rail? I never removed that. The only thing that affected it was the hose to the back of the Plenum that I will be looking at tomorrow. If not, which valve do you mean? Thanks again.

Thanks for the reply. I just double checked. I'm questioning everything. I actually left the original MAF sensor in position. I just removed the hose. The new unit is in the correct orientation. Thanks anyway

Thanks for the reply. Trust me, my ONLY question is what didn't I do correctly? The picture you have is brilliant. The fuel pressure regulator hose is what I am going to approach first. It was pretty hard & I probably should have replaced it when I did the job but I didn't have that size. I did...

This was exactly the post that I needed answered. Until the slanging match started:( I have a VY V6 with pretty much exactly the same problem. The main difference here is that it only appeared after I replaced the inlet manifold gasket. I have temporarily 'cured' the problem by disconnecting the...