heh, this just isn't funny anymore, 1st its the backfire and hesitation (cleared up by a bottle of fuel inj. cleaner somehow) Now, its dum dum duuuummmmm....Code 33!!
Whats this code stand for and what could be the potential cause(s) of it?

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-Future:
-383 Stroker?

 

Oh yea, the light normally comes on at 40mph+ at a steady cruise, but sometimes goes away with a sharp stomp on the pedal by me Otherwise it'll stay there until i come to a stop and accelerate (sp?) quickly... There no performance or driveing problems from what i can tell...

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-Future:
-383 Stroker?

 

code 33 high voltage /low vacuum at maf
check your tps voltage first .54vdc --free
next change your maf burnoff and power relays. --15$ each
if its still there,, new maf sensor -- $$$$$

 

How did i know you were going to say...eek
MAF! Hrmf...didn't think the MAF burnoff relay was the correct one, in the sense, autozone said..verbatem "Pontiac IROC-Z, hrm, that would be the fuel pump relay.."
and branz said "Pontiac IROC-Z, what...grr, where have you been?"
but anyway after like 2 months i looked in year one and thought that my relay shoulda had a rubber boot type thing, the new one did...grr!! ah well, thanks..MAF should be okay and if not..its lifetime warranty

------------------
89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-Future:
-383 Stroker?