Need help!!!!!!!

[hockey3266]

I am having a constant miss in the motor but i dont think its the motor..... I believe it eletrical or fuel issues........whats happening is i would go onto the track and the 1st time i pick up the gas i have great throttle response and great pull and once i go into the corner or get around 6000 rpms i have no throttle responce and the motor just breaks up when i get on the gas and starts missing and i try and put it back in netrual and clear it out and it sounds like it does by no throttle response when i get on the gas.....in the pits when we give it gas we can hear a contant miss...i have reaplced msd, coil, carb, distributer, cleaned fuel filter, clean fuel tank vent, even ran a hose straight from the fuel pump into a jug of fuel to see it might be a fuel line still same issue.....im on a reverse mount kse pump....someone help me out please...if you need more info just ask and ill answer what ever you need

[7uptruckracer]

Hvae you checked the pump rod, float level, and carb vent?

[hockey3266]

put on 2 differnt carbs same issue

[7uptruckracer]

Check fuel pump rod the tips can mushroom. and running under load fuel psi. Whats base timing and total timing

[hasben]

check your fuel pressure.

[hockey3266]

Checked already at idle 1-3 under load 6-10

[7uptruckracer]

Does it drop as your accelerating? or hold steady? Pull that fuel pump rod out and check the tip

[7uptruckracer]

I dunno why yours fluctuates that much. What regulates your pressure?

[autoshop]

might check or replace the battery, had on short out from the vibration one with same kind of problems

[hockey3266]

7up im on reverse mount kse no rod and the pill regualtes the pressure

[7uptruckracer]

Yeah I picked up the KSE deal about 2 mins ago when I was looking sorry. I've seen alot of guys post issues with that pump. Best most these guys will tell you is check for spill over while cornering, make sure the jets aren't sucking air(use extensions) and install something to monitor fuel psi as your running and the problem surfaces.

[hockey3266]

tried 2 differnt carbs and i know 1 of them works cuz we unbloted off one motor and bolted it on mine and same problem was still occuring and its not only in the corner its down the straight aways also.

[7uptruckracer]

That's strange. You've checked the fuel pickup in the tank, all your wiring (hopefully no crimped connectors) your battery Surface and Load Volts, your valve lash, springs, and cam to make sure no lobes are messed up, and your timing? If you have a gauge and its acting up I'm assuming you have good psi to rule out fuel? That only leaves motor and ignition system. what drives the pump the cam or trans?

[hockey3266]

pick up tube is good dont think its a motor issue becuz theres no miss at idle only under load.....and trans drives the pump...only thing we havent change is ignition wiring harness and battery...so those are next...then we will start checking all the wires to the tach, ignition switch, on and off switch, etc.... we had 3 smart people looking at this at the track and we still coudnlt figure it out!!!!

[7uptruckracer]

So many motors run as crisp as a new dollar bill at idle but we don't race at idle. I've had many carbs run great in the shop and even free rev and fall on their ass on the track with the wrong intake jetting and cam or timing unless its on your motor even if it runs well on another don't rule anything out. Check your plugs, your wires, your wiring connections into the distributor all that, and a battery can act that way I've even had a Kill switch issue do that.