I just did a tune up on a 2000 mazda 626 with a V6. the parts changed were the plugs,ignition coil, plug wires, mass air flow censor, air filter, and fuel injector cleaner. the plugs were gapped at .32.i took the car to have it scanned , and the code that came up was 0175 for the mass air flow censor or air to fuel ratio high pressure, fuel pressure regulator, or leaking fuel injector, or vacume leak. i have been checking for a vacume leak with no success by spraying starting fluid in and around vacume lines and the engine compartment with no change in idle. my question is there a diagram i can pull up on the computer of the vacume lines for the lines i might be missing, or is there some advise to try to fix the rough idleing?

SOURCE: 2001 MPV Runs Rough at Idle and Low end Throttle

This could be a bad fuel injector. Lean implies low fuel to the cylinder which will cause a misfire.

SOURCE: 2001 MPV Runing Rough at Idle & low end Throttle

the lean condition is the big clue here it indicates a lack of fuel which is causing the mis-fire on #3. I would suspect a fuel injector is clogged or not getting a pulse from the PCM. ( pulse is the electronic signal)

SOURCE: 2005 Mazda 3 idles rough at stop light and sometimes dies

The problem is a faulty solenoid in the vapor recovery system. The solenoid is sticking open and allowing fumes from expansion of fuel in the fuel tank to enter the air intake and smother the engine. This is how the Mazda service tech explained it to me. It is a known problem on the Mazda 3 in various trims which Mazda refuses to acknowledge. Usually the check engine light comes on and the engine diag code reads mass airflow sensor, which is incorrect. I dealt with this for 6 months on my wife's 2005 Mazda 3i before the dealership figured it out. My cousin bought a 2007 Mazda Speed 3 which developed the same problem after a few months and was cured by the same fix.

SOURCE: My '01 Tribute V6 3.0 has a rough idle at a cold

Don't waste your time. Have the intake manifold gaskets (upper and lower) replaced. Check all vacuum lines for leaks. Clamp all vacuum hose connections.
Do NOT replace any sensors unless the computer codes indicate.
THIS WILL FIX YOUR PROBLEM!

SOURCE: 1999 mazda 626 4cyl runs rough at idle , engine

You may have to dig deeper for a vacuum leak. It's possibly the intake manifold gasket. Try spraying some starting fluid around the intake manifold. Also try disconnecting the brake booster and plugging that hose, the diaphram in the booster could be ruptured, causing a vacuum leak. Check the PCV valve and hose too.