It was a one-way valve! We checked all the pipes and stuff like you said and I couldn't see anything wrong (plus I have no clue where a junkyard is) so we finally broke down and took it to A-Ok muffler and told them what the mechanic at Exxon had said about the brake booster. On the phone they'd said it'd be $225 for the replacement and labor. They checked it out and all that was wrong was that one-way valve being put on the wrong way. $60. Still not cheap for just that one thing but soooo much better than $225 and they did check all four wheels, brakes blah blah. whew. So thanks for all yoru help guys!!
BTW: what engine is in an 88 Lxi? I know they have numbers and all that.
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