I have a 2004 Isuzu Rodeo with a 3.5ltr. During first acceleration, usually when engine temp is at ambient, the engine bogs down. After the first acceleration itseems to run fine. Any ideas what might cause this? Does not do it long enough for "Check Engine" light to come on.

 

I had some issues to and never found out what was coseing the problem I started using Marvel mystery oil and that seems to work it out. after 20,000 of using this stuff it still runs great

 

I have the same problems, especially in the colder weather. The check engine light would come on and it would read a random cylinder misfire. I have had a few people look at it with no definitive answer. I was told that the direct injection engine end up with carbon build up on the piston. I have been usuing STP fuel injector cleaner every 3K miles and it seems to have helped some. I may try the mystery oil that security11122 mentioned.

 

I am having the same problem with my 3.5 direct injection. I had it looked at the first time the eng light came on and they said it was an o ring on cyl #1. they replaced the o ring and it was good for about a month and came back on giving a code of cyl #5 missfiring. Im guessing its o rings that need replacing.

 

In direct injection engines, fuel treatments usually don't help--the injector isn't in the manifold, it's DIRECT into the cylinder head. It's like opening your dirty window and spraying Windex outside. Often what has to happen is the intake manifold gets removed and some abrasive is media blasted in to remove carbon build up by brute force. BMW and MINI use walnut shells that are then vacuumed out.