I've seen other posts that say the 3.4 intake and exhaust pushrods are different lengths. I didn't find that to be the case when I overhauled my 94. I checked my box of extra parts (from the screw job junkyard 3.4) and all the pushrods look to be the same length. Just to be sure I wasn't losing my mind I checked the parts manual pdf. It says that the 3.4 uses pushrod #476525, quantity 12.

The pdf also says that the 3.8, the LT1, and the LS1 each use different pushrods but the intake and exhaust are the same for a given engine. So I'm scratchng my head wondering where this pushrod length thing is coming from???

 

Wow man, that's tough. At least you didn't lose the whole ride! But yeah, two minutes of flames is a big deal!

 

i have also heard that GM's DexCool eats through gaskets like no tomorrow and after about 150,000mi they start to take their tole on the intake gasketts, i had a 3.4 gm engine that the intake gasket went because of the orange DexCool. needless to say, if i ever see the orange, i flush it and switch it to yellow

 

You may want to check the vacuum hose going to the regulator, just in case the fire got to it. A leaky hose will result in high fuel pressure at idle and normal driving.