Well i brought this up about my truck being sluggish..but i think the reason is due to the fuel running rich and the constant missing on the motor...i mean this thing takes a mile just to get to 45 mph..and when it warms up and you get on the thottle the motor has a whole different tone..and it sounds like its trying to fight against you....i replaced all the common sensors...oxygen, MAP, ECT, and this fixed the sluggish part partialy but a couple days later it comes back but worse...i mean i cant even hit 65 anymore...so i am lost at what to do or where to go..so does anyone have any suggestions???

 

Have you set any codes? Why is it missing...plugs, wires, compression, vacuum?
Do you have a plugged exhaust?

 

when i got it scanned it said the MAP sensor or the circuit could be to high...and rich exhaust..i forget the numbers..i changed the sensor and it didnt help....their is a vaccum line that runs from the MAP sensor...but i have no idea where it connects to

 

I'll try to have a look under the hood of my '90 on Wednesday, it's fuel injected but it's at the bodyshop. My other trucks are carburated.
Does it make any difference if the engine is cold or warm.

Sorry for such slow response, I'm very busy with work and spring projects right now.

I was just reading your other post on valve lash adjustment. Did you adjust the valves and if you did why did you need to adjust them?
I'm starting to wonder if you have a worn camshaft which caused a clicking from the rockers and is creating a low vacuum in the engine....which would affect the map sensor reading and accelleration.

 

dont worry about the slow respoce..i appreciate everything....well lately its been sluggish cold and warm....but when i flushed the system it wasnt sluggish when cold....but when it gets warm it really sounds ****ty.. you can hear missing and everything..but only when warm..and i noticed it doing this alot after i tried to change the dizzy cap and rotor....

 

The distributor isn't loose by any chance? Just wondering if you might have changed the timing.
have you double checked your firing order? 18436572

 

yea..i checked the firing order a good 5 times..all this started to happen afteri changed the cap n rotor..ill check to see if it is lose or not..and how hard is it to check timing....

 

try checking for exhaust flow. is there a cat converter after the y pipe.??? if so it will be a bead type. its garbage so take it out and put a straight pipe if legal in your part of the world, or a high flow cat works good too. next put a 24 inch body magnaflow 3 inch with mandrel tail pipe. youll get nice sound with better acceleration. let me know if you have it fixed. I have a few more tips if this doesnt help.