SR running on 3 cylinder

[S14 Drift!]

OK, here is my problem:

I did the swap...everything was fine for about 1 week...until it started to run on 3 cylinder... (it slowly started to "misfire" and then it would run on 3 cylinder...the problem became worst and worst...until it would only run on 3)

Then we checked the plug...changed them...no difference

Then changing coil for the cylinder #2

Nothing better

Then swap injectors 1 & 2

afther playing with all that it was running on 4 cylinder (?<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'> we don't know why)

But later on the problem came back....but on cylinder #1 now.... now it was obvious that it was the injector that we swapped from cylinder #2....

I changed the injector for the cylinder #1 ....we were sure that it was it....everything was fine.....

And then the problem came back again....

I changed the CAS, checked the MAF, checked the coil, there is spark at the plug, and signal going to this injector...

What could it be??? I'm going crazy with this problem.

I hope someone have an idea...any suggestion would be good!

Thanks!

This is a SR20DET red top from a Silvia with a Black top #63 ECU from a 180SX, HKS 2530 Turbo, HKS 264 cam In & Ex, HKS cam gear, HKS metal head gasket, HKS blow off valve, 3" exhaust, front mount intercooler, boost set @ 12 psi, walbro 255LPH fuel pump, 370 cc injectors, 240SX SOHC MAF, Pulsar 88 Ignitor chip.

[DuffMan]

Maybe its not the injector itself but something with the two wires that control it. Maybe each time you messed arround with the injector, you moved the wire, temorarily curring a loose wire shorting/breaking. One wire gets a constatant 12 volts, and the other one is grounded by the ECU in pulses.

[S14 Drift&#33;]

I did check for stuff like that, I checked every injector wire, while moving them...twisting them

I also have a smal tiny bent in my fuel rail...

I posted this on another forum (freshalloy)...

And Jeff from Heavythrotle told me that it could be my fuel rail...that let's air comming into the cylinder....and like he said I ear a wissss sound when the fuel pump is ON, so it's sound like a air leak &nbsp;or something like that...

I will have a look a this!