so i bought a 92 dak it has a 3.9 magnum and a 5 speed.so after 2 tps sensors and a new timing chain it still runs like crap.no check engine light,not even any codes of any kind.when i start it if its been sitting i have to give it some gas pedal to get running.other wise it starts fine.when it starts the motor shakes so bad i think the drivers mount is going to tear.if i unplug the tps it will idle smooth for a bit and then go back to shakeing.and will stutter so bad trying to drive it normally that i just give up and red line it and dump the clutch and go for broke.and it runs good up above 3k.but then when it warms up it is more willing to just cruise like it was new.iac is working.tps is working.new plugs,wires,cap,and rotor as well.im just trying to figure this out.

 

Check the fuel system? Might not be getting enough, pump might be going bad, bad fuel.. etc

 

might also be an O2 sensor..

 

It's a Dodge! Quit trying to drive it in the rain!!!!
j/k. I couldn't resist.
Are you sure your check engine light isn't burnt out? Cuz I know even with bad fuel, my check engine light comes on whenever ANYTHING goes awry.... Had some ice in the fuel line somewhere... truck ran like crap and engine light came on....
Also... are you sure you don't have a bad spark plug? Check them all to make sure they're all a nice tan color, and are good and dry. If there's a "perfeclty clean" or wet plug... replace it. Dud plugs are actually fairly common..... and I don't think I've ever bought a set of 8 plugs and DIDN'T have 1 that was bad... or went bad shortly after changing it....

 

yep i checked the check engine light before i started all this.plugs are good.dide i mention that its back firing through the throttle body at idle.and yes i also checked the timing.