hey everyone i have a 96 ram 1500 with the 5.9, problems all started when the battery went dead truck would die occasionally upon letting off the throttle, i cleaned the throttle body and the iac, replaced the iac fixed that problem. Out of the blue the truck started having a buck at a certain point in the throttle which has gotten progressivly worse to the point i can't get above 45 or so, sometimes it runs great from a stop to about 30mph or so then starts breaking up, i've replaced the cap,rotor,plugs,wires installed according to the tsb, new coil, new throttle position sensor. please help i'm about ready to pull my hair out also the cat is not clogged. when it acts up its like someones turning the ignition on and off repeatedly. also keeps throwing code 43 no others besides 12 i believe which was just for the dead battery. thanks tom

 

Code 43? 96 should be obdII.......

I wonder about your fuel pressure........

 

Just curios, how do you know the cat is not clogged?

 

when i cycle the key it flashes code 43 i get that code repeatedly, fuel pressure i still need to check, any idea what the correct psi should be? zman it was gutted when my exhaust was installed years ago, also one thing i forgot seems to get a worse buck/hesitation as it come up to temp

 

http://dodgeram.info/Engine-Gas/OBDI/Fault-43.htm

 

zman thank you for the link i'm only getting 8mv to the coil with the key on engine off with engine running i get the full 13.9-14.5 volts

 

everything checked normal except the low voltage when not running

 

Coil will only be energized for a few seconds when you turn the key on. If the PCM doesn't see the engine turning, it will shut everything off.

 

I'm wondering if you got all of it out when you gutted the cat. Maybe not, and part's of it are blocking the cat again or got into the new exhaust. Unscrew the pre cat o2 temporarily and see how it runs for the hell of it.

 

removing the pre cat o2 made no difference, i cleared the codes i'm going to take it for a ride and see what will come up, also going to stop by a friends and check the fuel pressure if hes aroundthanks for all the help so far