My 2001 galant hesitates on acceleration. changes plugs oil air filter etc.. any thoughts?

going to ask a scary question, no insult intended. have you checked the OIL when was it last changed. Air filter fuel injected system uses air filter was it changed last... fuel filter, not sure how many it has, may want to have that checked. spark plugs have them checked look at them, they maybe fowled. so here is a link that address the issue.....

http://alvinalexander.com/news/toyota-rav4-throttle-lag-hesitation-stalls-acceleration-2006

air flow mass sensor is flowed up dirt gets in and causes it to respond very slow... good luck..........

The throttle position sensor needs to be replaced.

could be spark plugs, dirty fuel filter, air filter, Mass Air Flow Sensor. bad spark plug wires. Dirty throttle body or injectors. I would start with the cheapest and work my way to the more expensive things if it doesn't improve.

If by flat spot you mean "hesitation" , you need to check the status of fuel filter, air filter and fuel pump. Inspect your spark plugs also as a precaution to eliminate them as the culprit.

I have a 1993 Taurus GL V6 3.0L..I"am experiencing a loss of power. Hesitates on acceleration Only when It's cold.When is get hot it runs very good. I have Replace Spark Plugs Cap & rotor were change air filter & fuel filter & TPS/EGR..... & it has a rebuilt ENG in it...this could be a sensor. But which one could it Be?

What Can This Be?

DID YOUR LOCAL MECHANIC ALSO WASH THE ENGINE BAY??
IF SO THEN THEY MESSED IT ALL AGAIN, SPECIALLY THE AIR FILTER, IT GETS NASTY

DID THEY CHANGE YOUR FUEL FILTER AS WELL, AS IT SHOULD BE INCLUDED IN A REGULAR TUNE UP

BUT MY GUESS IS THAT IT'S ONLY THE AIR FILTER THAT GOT WET

check fuel injectors, fuel pressure regulator, air filter. cat converter, O2 sensor. failure of any of these wastes fuel. air/fuel ratio should be normal.

Start car and use a squirt bottle of water to wet the wires and coil, if you see it spark or run rough one or both are bad, repair the wires first as they are more common.

i would try cleaning mass air sensor, its mounted in air duct between air filter and throttle body, they sell the cleaner at auto parts stores, also as stated bofore make sure the intake pipe clamps are tight and it's not cracked, if that doen't fix it i would investigate a fuel pressure problem either a weak pump or problem with regulator

Depends how long since your last tune up and mileage. I would do a normal oil change, oil filter, air filter and plugs. If she still does it, try checking for a vacuum leak. Start the vehicle and spray "lightly" carb cleaner around your vacuum lines. If you have a leak the engine will increase in idle suddenly. Replace the line or part. AS A LAST resort and pretty rare is the distibutor. They usually run about 75.00 to 110.00...hope this helps.