i may have to start by replacing vac lines/fittings one by one... used brake cleaner and/or wd40 and noticed no change whatsoever. saw a few of the rubber ends that were cracked a bit, but they werent leaking. (both brake cleaner and/or wd40 should be a decent subsitute for the carb cleaner, right?

would a bum MAP sensor cause a vac leak? i swear i hear something back there, but cant determine if it is vacum or the EGR... but i have no MAP codes, only the system too lean P0171 occasionally (it's not coming back on immediately after clearing.