1999 Altima
92k miles
3 weeks ago, After a steady 30 minutes of highway driving I came to a red light at ramp exit - stopped- idle fine- pushed gas petal and my car hesitated for about 5 seconds then 'woke-up' and drove fine. CEL came on - MAF. Only time this happened was from a complete stop but not all the time or every day. after a week or so it started to get worse. Cleaned MAF with CRC MAF cleaner, left out of car for 24hrs and cleaned air intake housing and attachments.
Replaced: Air Filter and Air temp senser (located in A.intake prior to Filter) Car fired up first time. drove 5 miles, problems persisted.
While car idled in driveway, noticed belt around alternater turning slower
Idler pully wabbly. pulled it off and found it was in great condition. 
just loose? 
put everything back together and tightened up. Then changed:
distribitur cap & rotor
fuel filter
Coolant temp senser
coolant temp switch (located in water outlet)
upper rad hose
lower rad hose
thermostat
thermostat housing
fulshed coolant (stuck hose on top of rad low flow, came out bottom clear - stuck hose in top rad hose came out of engine clear)
Sealed power steering pump fluid reservoir as it was leaking at hose connections.
Now Rad coolant fans will not come on AND stupid car still hesitating. Idle car in drive way 15 minutes fan will not come on. temp gage in car reads ok. BOTH radiator & hoses (upper and lower) become extreamly hot. Turned car off to prevent damage.
Only code i get is MAF. Checked fan fuses in box next to battery look ok.
Went to justanswer.com tried to get help. the guy suggested the thermal control amplifier
not a clue what or where that is. When i asked the guy said it's located under the right side of the dash at the evaporator case. 
Starting to feel like i'm not going to get much from this guy. i have a digital multimeter engine analyzer but honestly havent used it much.
OH 1 last thing maybe it's nothing. a few months back ac started acting up. sometimes it would work sometimes not. finally gave out. i replaced the blower motor resistor and it works but only on heat.
thanks in advance for all your help.