What you CAN do is use a 5.9 ECU (it's close enough that it'll adjust and not run the 5.2 overly rich) to get yourself running.
Then, after it's running, contact a tuner such as Flyin' Ryan (frptuning.com) or Marty Fletcher (utawesomeperformance.com) and get them to do a tune for you, with something like a Syked or SCT or HPTuners handheld unit to write it to the ECU to correct for it being a 5.2.
Before you panic too much, write them or talk to them; there's a chance (outside, but a chance!) that the 3.9 ECU has all the hardware installed, it just needs a tune to wake up the other two injectors.
(Or it might not have the hardware installed - I dunno, but hey, I'd ask!)
THAT said - also check "the usual suspects"; car-parts.com shows 3 as I type this message (it shows 4, but one comes from a 4.7L truck, so I HIGHLY doubt it's a good pick.)
RwP
Then, after it's running, contact a tuner such as Flyin' Ryan (frptuning.com) or Marty Fletcher (utawesomeperformance.com) and get them to do a tune for you, with something like a Syked or SCT or HPTuners handheld unit to write it to the ECU to correct for it being a 5.2.
Before you panic too much, write them or talk to them; there's a chance (outside, but a chance!) that the 3.9 ECU has all the hardware installed, it just needs a tune to wake up the other two injectors.
(Or it might not have the hardware installed - I dunno, but hey, I'd ask!)
THAT said - also check "the usual suspects"; car-parts.com shows 3 as I type this message (it shows 4, but one comes from a 4.7L truck, so I HIGHLY doubt it's a good pick.)
RwP
