I've got a full size 94 blazer with 5.7 350, TBI in it. We just put a new engine in, the other was beat to all hell. After putting the new engine in, everything fired up and ran perfect. Only problem is there was a leak around the back left bolt hole on the intake manifold that coolant was coming out of. I've now started to look for a new intake for it, tried an intake a friend had from his truck, which looked to be the exact same one, but it wont even run right (chokes out if you take the foot off the gas, and it backfires like crazy).

Does anyone have any ideas as to what aftermarket intake manifold I could buy? A new OEM intake is about $350 and I dont want to spend anywhere near that. I however have not been able to locate much at junk yards and there's no guarantee they wont be warped either.