Can anyone help me... While keeping a steady speed at about 50 my truck starts sputtering/shaking. I cleaned my tb which was all gunked up which I was told to do but still shakes. It runs perfect doing anything but keeping that low1500-2000 steady rpms. I have edge evolution, roush CAI and a air aid tbs. any suggestions or help?

 

Hey man,

Mine was the same way. I don't know if yours is throwing a CEL or not but mine is throwing misfire and left bank lean. These match up with the timeframe that my truck was having the same symptoms your truck does. The only advice I can offer is my experience so far which is replacing the cheapest parts of the air/fuel system one at a time. Fuel filter, Idle Air Control Valve (IAC), plugs, wires. So far I'm getting the same symptoms but I haven't done plugs/wires yet. The other stuff I've done.

 

Bad coil? How old are your plugs? Could be a swollen/cracked boot?

 

(1) Let's first eliminate, Plugs and wires, boots, distributor cap, because it would first be noticeable accelerating or climbing hills as those instances require more power from the engine and stelling on the gas pedal causes more compression (compressed air) in the cylinders and makes it more difficult for sparkplugs spark to jump the plug gap and that in turn causes spark to the point of least resistance, which would be a weak plug, wire, cap, boots to ark out first and make the engine miss, backfire, afterfire, run rough. (2) The coil, hmmm? I've never had a coil problem in 66 years and a whole lotta vehicles. Having said that, I would think that the same thing with it. I believe that under the stress of accereration it would also break down. But, too many ""mechanics"" will replace it, and when the problem still exists state, "well you needed it too." (3) Of course, we don't know what year, engine, or modifications to it, what steps you've already eliminated. Sooo, possibly if you have injector pump then I would check the fuel pressure of the fuel rails at a steady 1500, 1700, & 2000 RPM, and it should remain constant. ***the air fitting looks the same as a tire air stem, but is smaller than standard. You could possible borrow one from your local repair shop or buy one at auto parts store.*** I made one from garage junk.
You'll have to find out what the pressure should max n' min. (4) A broken or loose vacuum hose, plastic air fittings and the like, can create a multitude of problems similar to what you discribe and more. (5) I from here would say that you don't want to take it to a expensive shop. If so, good. Just keep at it if you can and it could be the very next, even simple, thing you do. I'm 69 and still learnin something new daily. It's not your fuel filter either or you notice it first on acceleration too. Somewhere on one of these pages to anothers question, someone said it was probably fuel filter...because Fords are known for their fuel filter problems. What's so different about a ford Tank or filter from any other.________good luck and when repaired, let us all know "the fix."..........Griz

 

I took my throttle body off and it was pretty gunked up cleaned the **** out of it and havent had a problem since