My 2005 with 90,000 miles has had its share of issues 3.8l v6. The current being when you first start it up it may or may not idle bad, but then to have flat acceleration for the first 2-5 minutes before acting normal the rest of the drive. Typically doesn't happen again until the next time you hop in to go. I have read some post and started with changing the EGR. The issue still occurred. I have to change the convertor at 40k miles and 85 miles like due to the burning through a quart of oil every 1000 mile issue. I have had the car since it had 38k miles. There has been no check engine lights or any codes to read with the issue. I have changed O2 sensors and well as the EGR. What should be my next step? Thanks in advance for the help all!

 

I do not have an answer to the Acceleration Issue (hopefully someone chimes in).

But my Pac had the oil consumption issue at 30k miles, I went to using 10w-40 engine oil 14 years ago and the oil consumption went way down, still way down w/ 336k miles on the clock. In regard to the converter issue, get the oil consumption down and then if necessary use the "spark plug anti-fouler" strategy to keep P420 cat codes in check.

 

seen a coil do this plugs and wires as well