I drove my car firday all day and it was running fine, nice and strong.
I didnt drive it all day saturday or sunday. it was raining both of those days. Monday i go to drive it. i start it up and it sounds weird, like kinda muffled. My car is one of the loudest around here so i can really tell when its not sounding like it normally does. I pop the hood and with my hand manually rev the engine. it seems like it took a second after i opened the TB up for the engine to actually rev. today i drove it to work and it still seemed weird. still quiet and down on power. On the way home from work i went from a dead stop manually shifting it and it was really bad. Its shifting normally and everything, but it was just real quiet and real slow. Any ideas whats going on? Im not getting an SES light. My cat is punched so its not clogged up. Any ideas??? Maybe just needs a tune up and an air filter, my filters are pretty sad right now. thanks for the help.

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1988 IROC-Z L98
License Plate: STG KLR 1
Engine Mods:
Edlebrock TES Headers, Hypertech Chip, Flowmaster Muffler, Intake Airfoil, Removed MAF Screens, MSD-6A, MSD Blaster 2 GM Coil, bored .030 over, Other minor mods
Suspension Mods:
Lakewood Traction Action Lift Bars, Hal Rear Shocks
Trans Mods:
2,500 stall converter, Redline clutches,Heavy Duty Steels, Trans-Go reprograming kit , Heavy Duty 2-4 band, Corvette Servo, B&M Mega Shifter w/ Carbon Fiber Handle (looks sweet in a black car!)
ET: 13.833@99.30

"If you can put it on your car, its fair" Quote By Guido
Foundering Member of the Illinois Overkill Crew (IOC)
www.mfba.org

 

Stupid as this sounds , are you sure someone didnt stuff something way up your tailpipes , like a rag or something?????? Dirty filters will put you down on power slightly but not like you say and it wont muffle the exhaust , take them completely out see what it does and for kicks check your tailpipes

 

check the tps make sure it's working properly it might give you the correct reading at idle but not wot check that also check the spark plug wires if 6,7,or 8 is craacked or melted it wont stuuter as much as if the number 1 is melted.and then if the engine detonated hard enough the electrode or tip of the plug could have melted happened in my old engine

 

i got some bad gas once in my 88 LB9 iroc and it did kinda what your describing. it went away after i put some water remover in the tank, drove it around and filled back up with different gas.

 

I agree, put some water remover in the tank and then run it all out and goto a different station to get gas and see if it makes a difference.

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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)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR
-Gutted Air Boxes