Any help with this engine issue??
 

Hey guys, im running a 05 A/T 8, with 36000 miles on it. Im coming off a replaced engine a few weeks ago, and now im dealing with an issue I cant figure out, and I dont have time this week to get to the dealer. Never thought id have a f$#@in car with 36000 miles, a replaced engine already, and engine headaches like crazy..

-Around 1000- 2500 rpms the engine jerks and the car seems to buck a little no matter what speed or gear im in.

-When I come to a stop, the rpms are dropping back and forth, below 1000, not enough to stall but close. The volts are also dropping on my gauge. I cant figure it out, does it sound like coils? maybe a compression issue on the new engine? any advice before i find some time to get to the dealer would be great. Thanks guys

bump?

sounds like possibly coils or battery? My idle has always fluctuated in my MT since the day I bought it so Im kinda used to that. IDK AT's too well....

The MAF (mass air flow sensor) could be the issue, but unless you get a new one it would be hard to troubleshoot. You have a aftermarket intake, did the dealership put it back on right? Did the MAF get dirty while your engine was out?

maybe the alternator/battery coils give us some history of maintenance etc