Check engine light/1995 Honda Civic EX

Hey All,

Here's my problem. In the the mornings when I start my car, it turns
over but doesn't want to crank. So after several tries, it finally
starts with trouble, then the check engine light comes on with low and
irratic idle rpms. I have to let it warm up for about 10 to 15 minutes
every morning. Since I can't drive it when the check engine light is
on, I just shut off the car and attempt to restart it. Sometimes it
starts immedately with no check engine light, and sometimes it does the
same thing I described above. It is taking me a minmum of 30 minutes
to get my car fully running. Everything runs as normal when the light
is off, even the rpm idle speed is perfect. I took it to the auto
parts store and they said it could be the TPS sensor or it could be the
Idle Air Intake Valve (sensor?). My mechanic friend says not so. He
said my model car can display the codes I need to solve the problem,
and he says I don't need a diagnostic tool to do so. He mentioned
something about using a jumper cable. I have no clue as to what he is
talking about. Does anyone know how to do this or what my problem
might be?? Car seems to be having this problem less throughout the day
but still every morning since the oil change people changed the oil to
5w30 instead of 10w30. Also, added Gumout fuel injector cleaner to my
tank this morning hoping that its just clogged injectors. We will see
if I can start my car tomorrow morning! Please, any help is much
appreciated. I am trying to save money since I just put $925 into the
car in the past 6 months!

Repairs/Maintenance to date:

Oil and filter change
air filter change
fuel filter change
distributor cap, wires, and roter changed
spark plugs changed
water pump and timing belt changed
coolant flush
rear main seal replaced

Other problem:

A/C doesn't work anymore. When turned on you have hear it pull from
the engine, but there is no air hot or cold what so ever. Is it
possible that the compressor died?

Thanks,
Mitzy