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I have a 92 w/ the 5.7 tbi 5spd I am have some possible major problems. It is bogging down when I try to hit hwy seeds it does good in town unless I try to lay in to the gas I have already replaced fuel pump, fuel filter, tb, plugs wires map and maf sensors, rotor, cap, and added a tb spacer and I am still having the same problem. I'm contemplating replacing distributor and timing chain and gears and possibly top end rebuild..........
any tips to make it as cost efficient as I can make it will be much appreciative
 

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sounds like maybe vacuum problem have you had someone check for a vacuum leak yet? its been awhile since i been under the hood of an early 90's model.. isnt the distributor still vacuum advance?
 
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