need help to cure some codes

after replacing stock injectors and maf with 42# lb injectors and a 75mm MAF - i get the following codes

565 Canister purge solenoid circuit fault
157 Manifold Air Flow sensor fault, low voltage

I get a CEL often when car comes to a stop - also engine tends to stumble but does not stall. Otherwise car seems to run okay.

What can I do to try and get rid of this CEL and cure these codes ?

any input is most welcome !!


FYI have the following mod's

-ported supercharger
-180' T-stat
-raised top
-double intercooler w/ permaquik fan
-aluminum drive pullies
-9 inch K&N cone filter w/ 3" CAI
(air silencer removed)
-chip and tune (tuned for 42@ injectors and bigger Maf)
-custom exhaust
-10% OD SC pulley

Sounds lika a bad MAF. You could hook up a multimeter and watch the voltage.

565

see attached quick test. and follow directions.

code 157

please see attached and follow the quick test directions.

157 continued...

the rest of the quick test directions