Car is revving in idle, you can feel it pulsing when driving. Have checked all the vacuum hoses and replaced the sensor assy.map. What else can i try?

Possible engine vacuum leak or faulty MAF sensor.

the map sensor fail means (DTC code not stated sadly)
mean the voltage is stuck at 5v or 0v.
near
the ECU never lies about this, ever.
the ECU enters FAILSAFE mode , in this case. (limphome)
and runs rich has heck , horrid rich, misfires.
RPM limited
idle controls disabled.
and retarded spark timing.

pretty much worst of the worst for EFI ops.
all you need to do is post the DTC error. and all that is what matters.
new MAP time, or fix the vacuum hose. its clogged? cracked.
make sure the vacuum leaves the intake manifold (sucks) and
makes it all the way to the MAP on the fire wall and that the
tiny filter(check valve?) inline is clogged, (blown through it)

This is a G16A ENGINE, With an ECU that does not create or control spark, (old style distributor with mech, and vac, advance)

DTC 31 or 32??????????????????????
http://www.fixkick.com/CEL/CEL.html#OBD1codes

if vacuum line is breached to map , the vacuum is not 0" HG
the MAP outputs 3.9V

the ECU trip points i do not know. but
above 3.9 or below .5v it will trip... somewhere,

here is very good map , graph

http://www.fixkick.com/sensors/my-map.html


all testing of it is here
http://www.fixkick.com/sensors/tests/MAP-testing.html

with photos and how to back probe it with an volt meter.

fiat punto old one ,check the vacumn pipes for perishing and damage if they all appear ok then remove the idle control valve and clean it all out including the hole it fits into ,it looks like a round black cylinder on the inlet manifold with a 4 wire multiplug connection and when its removed it has like a bulet shape on the end ,make sure the rubber seal on it ok as well

IAC valve @ throttle body regulates the air/fuel idle. its right in front of the throttlebody, replace it, MAP sensor works together with IAC, both could be your problem. everything else you did is good, I feel these items are necessary to put you back in bussiness, just do it !!!

Check the fuel pressure regulator for to much pressure.Pull the vacuum hose off the map sensor and if fuel runs out then replace the regulator.

Plug the vacuum line you unplugged and the idle should come back. Change your air filter and the map sensor. check for correct coolant level and replace the coolant temp. sensor. This sensor affects cold starting and idle through the ECU (open loop mode, rich fuel mapping and 1200 rpm idle) It should go to closed loop mode in the ECU once engine warm up is achieved ( lean fuel mapping and normal 900 rpm idle). Do not unplug anything else till you perform an OBDII scan of the stored fault history

Well, something related to manifold pressure is at issue. Look for intake leaks, cracked or dislodged hoses. Check engine compression, it appears that the Map sensor was a victim and not a cause. This is often the case with error codes.

replacing these items won`t cause your problem.you will have to find out what code set the light and go from there.you don`t say if the revving is at idle or not if it is you could have a bad idle control motor or a cracked vacuum hose that acts up at certain times.even a bad throttle position sensor(tps),egr valve,so its important to know what set the light on.

your IAC idle air control sensor is probably gunked up and if it is so is your throttle body...also check all vacuum line for integrity..i found a bad hose going to my MAP sensor..both of this caused problems.
Clean the IAC with throttle body cleaner not carb cleaner, and dont clean the map sensor its contolled by air vacuum, just replace the hose if found cracked, if its bad you have to replace it it cant be adjusted.

better be looking for a vacuum leak, pinch off the hoses one at a time, when the idle drops you have your failure