I have a 1989 2.8 v6 firebird that I bought used . The car ran like crap when I bought it but it only had 82k miles on it so I figured there cant be too much wrong with it.
While working on it I discovered that the previous owners burned out the exhaust donut on the passenger side thus melting a couple vacuum lines and the EGR vacuum solenoid. I replaced the solenoid with a new one,repaire one of the vacuum lines coming out of the firewall {the other one I blocked off because I have no idea where it goes}and now the car runs better. The problem is at cruising speed you can feel the car jerk a little , like it is running too lean or something. EGR I had off and cleaned and its not leaking any where and there is no error code.
Could it be the O/2 sensor or something like that. Or the second vacuum line coming out of the firewall that I have no idea where it goes. Also there is a sensor with 1 wire that screws into the back of the cylinder head on the passenger side , what is it for?.
Also Timing is Fine and plugs look good just a hint of tannish white on the tip.
Thanks

 

the sensor in the back that screws into the back of the passenger head is where the fan grounds and thus turns the fan on.

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1989 Firebird. Modded.
700r4-->t5 w/ram clutch
Cold air, 1.6 rockers, 21lb injectors, 3" y-pipe, random tech cat, 3" ipipe, flowmaster 80 series 3" in 3" out hand made stainless tips, Lakewood LCA's, Msd 6a, Msd coil, Wonder Bar, 180* stat,
Coming Soon: T/a hood, Painted,Spohn Panhard Bar, 4thgen Front Seats, Cam!, Msd 8.5 wires, Posi (ACCEL IS CRAP)
"I'd rather run last in a full out race, than to NOT have run at all"
See my car Here!
In Memory of #3 Dale Earnhardt

 

is there something about 2.8L and EGR's screwing up?

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- David
88' GTA 350 MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT