I am not sure what it is but the car just seems slow to me. I haven't raced it at the track yet so I am not sure if its just me or my imagination. The last time I was at the track I was running 15.7's which is very bad since I have run 15.1's before and that was about 3 months ago. I thought maybe my fuel filter was just plugged (which it was) but it even feels slower now. Think my fuel pump is starting to go bad on me?

I gave it a full tune up, new plugs, fuel filter, did the K&N cleaning, my wires are still good and my fuel pressure is at 11psi and the plugs are a perfect tan. I know my valve seals are going bad cause at cold starts I get a small cloud of greyish smoke. The car has 119,000 miles on it. Think its old age is just showing?This is my mod list.
--Flowmaster 80 Series Muffler
--Custom 3" Cat-Back
--No Cat
--Edelbrock TES Headers
(3" collector Y-Pipe and Coated)
--TB Spacer
-Adjustable Fuel Pressure Regulator
-Injector Spacer
-Ultimate TBI Mods (Throttle body modified)
--K&N 14x3 Open Element
--MSD Cap/Rotor
--MSD Blaster Coil
--MSD 8.5mm Superconducter Wires
--AC Rapidfire Plugs
--March Underdrive Pulleys
--180 Stat
--Hypertech Thermomaster Chip
--Pollyurthane Trans Mount
--TransGo Shift Kit
--B&M 28,000 GVW Supercooler
--3:42 GM Motive Gears
--SLP Posi
--KYB Gas-a-just Shocks
--KYB GR-2 Struts
--Edelbrock Strut Tower Brace
--Kumho ECSTA Supra 712's 255/50/ZR16's
-Hawk HPS Brake Pads
--ASCD Ram Air Hood (modified)
--Lakewood Lower Control Arms
--Emissions Pulled
(AIR and Smog Pump)
--166*/176* Hypertech Fan Switch

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1991 Firebird 305
Eric Natzke
"It ain't Stock"
http://members.aol.com/j007golden/91firebird.html
AIM: J007Golden

 

I'd do a compression test and if the values are marginal, I would suggest a leakdown test.

 

Hey, have you ever used the GM Top Engine Cleaner? I just used it on my 305 TPI. It was like a tune up in a can. It costs about $6.00 a can. You pour it down the carb and flood your motor so it stops. Let it sit 15 minutes. Then restart, and pour the rest down the carb at high idle. It really cleans out the system. My throttle response and idle are much better now.

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Blue '86 IROC, 305 TPI
Ported Plenum, gutted air boxes, SuperChip, KN filters, TB Airfoil, transmission cooler... more to come. Not raced yet. 70,000 original miles. Owned since 1992.

 

No but I might try it out.

I always use Mobil 1 synthetic oil on my car and AC Delco oil filter every 3,000 miles so I imagine my internals are pretty clean but my intake may be dirty inside.

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1991 Firebird 305
Eric Natzke
"It ain't Stock"
http://members.aol.com/j007golden/91firebird.html
AIM: J007Golden

 

Eric,

Get a fuel pressure gauge with a long hose. Hook it up and tape it to the windshield. Watch what it does at WOT. If the pressure drops u need a fuel pump. If it doesn't look elsewhere.



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Mike L.

1987 IROC Z 5.7 TPI A4 3.27 Borg-Warner four wheel disc
Mods: 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified airbox w/ K&N's, Relocated MAT sensor, Gutted MAF, 160* thermostat, MSD 6A, Accel 8mm Wires, bypassed TB coolant, 3" Flowmaster 3 chamber single outlet, custom adjustable cutout, 3" MAC mandrel intermediate, airfoil, ported plenum. !smog, Crane AFPR, Accel rail mounted FP gauge, Harlan shiftlite, 24lb. injectors, Hedman headers, a few others I forgot...??? FINALLY GOT PAINT!!

Check out my IROC webpage!