Way above my paygrade

[flyboyjack]

Hey guys, ('n gals),
Here's what I've got going. All original truck with a 350/350 and 110,000 miles started running a little hot in stop and go down here in south Florida. Put in new fan clutch and high volume water pump. Flushed radiator and new coolant and "water wetter". Then replaced OEM quadrajet with professionally rebuilt q-jet. Set timing and rechecked. Tuned q-jet with vacuum gauge. The old mpg's were 10-11 around town and 14.5 to 15 on the road. Did a 400 mile road trip. Got 12 mpg! Also the truck ran warmer, (not hot), just warmer than usual. However once back in stop and go traffic, temps cooled back down to normal. (I'm estimating a 15-20 degree drop and rise). And now in my suburban driving mpg's are 13+!!! and 12 on the highway. Just again did a short jaunt on the freeway. Temps back up,...once back in the city, temps back to what I know to be normal. Also top end above 65-70 mph, power seemed to be gone and I used 1 1/2 quarts of oil in 400 miles. Again, once I'm back to suburbia, oil consumption back to 1 quart/1000 miles. Looked for vacuum leaks. Rechecked timing. HELP!!

Jack