I have a 93 f-150 striaght 6 300, 5 speed manual trans. when i push on the pedal the engine seems to hesitate and little and the will begin to pick up gradually , and not quick like I think it should. I dont quite know how to explain it but the engine is running rough, not smooth and all or like it use to. I have given it a tune up, plugs,wires, roter,cap,fuel filter,air filters. and have even changed the cattilitic converter. I have two of those I replaced the first one and replace the second with a stright pipe. all that seem to imrove the situtation but it stll almost seems to chocking out for lack of betters decription. when ever I put my foot on the gas. can anyone help.. is thier a air flow sensor that I should check?

 

are your plugs firing properly? perhaps ur timing is a bit off... i'd run a compression check too while u were at it too just to know everything is good in the engine...that's where i'd start if it were a hesitation problem like u say u've got

 

how would i determine if the plug were firing right, and what is the proper compression for it.

 

Did this just start happening? I mean the truck has ran great in the past or did you buy it like this? Check your firing order at the distributor, the front cylinder is number one then two... on back to the back one being number six. The firing order is 1-5-3-6-2-4. You may also have a cracked distributor cap letting mosture in it. If all this checks out pull the plugs one at a time and see if you have spark, while you have the plug out check the comprression, all the cylinders should be close in compression. I would have to do some digging to find a compression number for you. But for now write down what the reading is and see if there is a weak cylinder. Also look for vacume leaks in general. I found one on the line going into the intake of the throttle on my 92, right on top by where your air enters from the filter. Another problem could be a clogged catalitic converter, check to see if you have a go healthy exhaust flow coming out of the tail pipe.