08 dodge ram 4.7 weird idle and bad throttle respons

[20ram08]

i have an 08 dodge ram with the 4.7 that i just bought about 2 weeks ago. so far i really like it. i went and had my muffler taken off and dumped right before the rear axle. with the exuast loud now i can realize that some times you can hear the exuast and sometimes you can barely hear it at idle. when i first start it it idles at about 1000-1200 rpm then after a little bit it idles down or when i put it in drive or reverse it idles down. in drive sometimes you can notice a VERY slight surge. doesnt seem to have much power. maybe only because i got into this after getting out of driving a 400hp diesel everyday? what could be causing this? any help would be greatly appreciated! changing a differential bearing this week because i have one howling so if i can find out whats wrong with it to be doing this i would also like to fix this at the same time!

 

[redram2007]

Have you done a tune up on it yet? plugs, clean tb, etc.

 

[NHDuckHunter8003]

How many miles are on it? If the throttle body hasn't been cleaned than it may be the culprit.

 

[20ram08]

it has 78,000 miles on it. no i have not done any tune up on it yet. wanting to do plugs, tb clean, oil change all that just waiting till payday.

 

[NHDuckHunter8003]

I bought my '04 with 72,000 miles on it and the tb was pretty gummed up.

 

[20ram08]

did it make a big difference when you cleaned it? if so im doin that right now. lol. itd be nice to find out thats all it is. iv heard grounding the tb to the frame or fender helps also. is that true?

 

[Bad Habit]

only with the electronic tb's. Look into a throttle position sensor also. But def clean the tb and do copper core plugs. I run vpower ngks in my dodges.

on tapatalk from my GS3....

 

[20ram08]

mine is electronic tb. and im looking into one of those also. but only one iv found for my truck is 332$?? ouch! thats a bit for a small sensor

 

[20ram08]

top plugs are considering intake plugs and bottom are exhuast correct?

 

[moparman]

some backpressure in the exhaust will probably solve all your problems. diesels run fine without a muffler but a gas v8 with no muffler just sounds cool and thats about it. No back pressure= No power. If your changing just 1 diff bearing then you might as well do them all while youre in there. if youve never done a chrysler 9.25 rear end, i dont recommend it. theyre not like a gm or ford with shims, these have collars to adjust the backlash and need a special tool. I did mine and it was no walk in the park

 

[NHDuckHunter8003]

I run the same plugs. Yeah I noticed a little difference when I cleaned it but nothing crazy. My truck wasn't acting up so there wasn't much difference. I was just looking for something to do and learn something new because it was the first time doing it.

 

[inktoxicated]

i have 08 4.7 65k. i changed all plugs (16) at 62k the stock ones were still clean. i swapped to iridium denso. put a muffler on the truck itll run better. as for the idle when i crank mine cold itll idle high then slowly come down to about 7-800 (1-2minutes) dependant on temp outside. when its fully warm it sits round 5-600.i just hooked up the superchip flashpaq on the 91 tune and it definalty made a good diffirent in power with 35 inch tire and lift. but if ur coming from 400 hp this would definalty feel like a dog compared to that. this a heavy truck. take out the spare tire to save a lil weight. i know after im done with these nitto trail grappler 10 ply tires im goign with 6 ply or something lighter. having a big mean lookn truck is cool and all but it needs to have balls too lol. your 08 should have like 310hp stock. give it a tune up change all the fluids too. oil,trans,rear diff,coolant. as far as throttle respone there is a lot of dead pedal in my truck too. like i can slowlt press the pedal and nothing happens, then once it hits a point itll rev up and go.. not really feeling that, would like a little more control. the flashpaq seemed to smooth out the gear changes too