I swapped a TBI 350 out of an 87 burb into my '85 K10 in place of the tired Q-jet 305. My old PS pump had gotten to where it would randomly whine very loudly. So I decided I'd just leave the one from the burb on the engine and get a new pressure hose just to cover all bases. Now, after the swap, my power assist is very weak at idle, but only once the engine is fully warm. I don't remember that being an issue the couple times I drove the Suburban, and it certainly wasn't in my truck with the old PS pump. I'm using Castrol Transynd (fully synthetic ATF). One thing I notice is that the new pressure line seems very close to the exhaust manifold. The manifolds on my 305 were the horn style that went up over the spark plugs - usually more prevalent on cars I think. I don't think they were this close to the PS line. There's only maybe 1/4" between the new pressure line and the 350's exhaust manifold. Anyone else ever had an issue with weak steering assist because an exhaust manifold or header was heating the lines up? See pics: The only other things I can imagine is that the pump just happened to start crapping out after the swap? Or I haven't gotten all the air out (doubtful since I've been driving it for over a week)? Or maybe the fully synthetic ATF is too thin when fully warmed up (doubtful)? I know for sure the belt is very tight - besides it'd be more likely to slip when cold, not hot.