Truck Repair: chev truck problem, throttle position sensor, vacuum leaks

Question
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Followup To
Question -
i have a 88 silverado,5L motor fuel inject.all tune ups have been done:fuel filter,oil change,spark
plugs,fuel filter,distrib cap,spark wires,pcv valve,air breather gasket,air filter,changed all leaky
exhaust components,oxygen sensor,throttle position sensor and timing.it still has a rough idle
going low to almost stalling to reving high for a few seconds.when on the road it fights to get to
hiway spd(straining).gas mileage is horrible ,1/4 tank for 20 miles.approx 10 miles to gal.my
tranny was rebuilt about 80 thou ks ago.motor is factory rebuilt 105 thou ks ago.would a faulty
computer do this or failin tranny?please help n thnx.
Answer -
I didn't see where you have cleaned the egr valve, or looked for vacuum leaks.
The egr valve is like a big vacuum leak if it is dirty, and seating on carbon.
The brake booster is another possible vacuum leak.
Van
i did a spraying of wd40 on the throttle body no change in idle.dont know where the egr is and
ive been doin a search on net for it.can you suggest some self help books or site.

Answer
At your public library, in the refference section, they have service manuals for that vehicle, as well as Chilton, Mitchell, and Motors manuals. You can make copies of the pages you want, but the library may not let you check the books out.
The EGR valve looks like three solenoids connected together in a little triangle, on the intake manifold usually, with a connection to the exhaust.
Van