99 4Runner "stumbling" at idle and acceleration
#1
Registered User
Thread Starter
Join Date: Feb 2005
Location: Westminster, CO
Posts: 1,153
Likes: 0
Received 0 Likes
on
0 Posts
99 4Runner "stumbling" at idle and acceleration
Hey guys. I need some help here. I have a 99 4Runner with the 3.4 and about 225k miles. All of a sudden it's "stumbling" when sitting at idle. It runs fine then "stumbles" for a second then runs fine for about 20 seconds then "stumbles" again. Also on acceleration when you first start out it seems to miss right at first then runs fine. Once you are moving it runs fine. It only does this when you are moving very slowly, especially when backing up. It actually seems like it's going to die when you are backing up it's so bad.
I've replaced the fuel filter and it fixed it for a minute, at least long enough for me to drive it. Then when my wife drove it about 20 minutes later she said it's still doing the same thing. We are going on about a 500 mile trip here at the end of the week so I'd like to get this figured out. Also, no check engine light is on.
Thanks for all your help.
I've replaced the fuel filter and it fixed it for a minute, at least long enough for me to drive it. Then when my wife drove it about 20 minutes later she said it's still doing the same thing. We are going on about a 500 mile trip here at the end of the week so I'd like to get this figured out. Also, no check engine light is on.
Thanks for all your help.
#6
Registered User
Thread Starter
Join Date: Feb 2005
Location: Westminster, CO
Posts: 1,153
Likes: 0
Received 0 Likes
on
0 Posts
Plugs were replaced this summer. I haven't had a chance to do wires yet. I'll pick some up today and do that along with cleaning the MAF and throttle body tonight and let you guys know.
Trending Topics
#9
Registered User
Whew, those were some old plugs! :O
But yeah, had this problem a year and a half or so ago, got them plugs and wires swapped out for some new ones, ran great!
But yeah, had this problem a year and a half or so ago, got them plugs and wires swapped out for some new ones, ran great!
#11
BUMP
I have exact same problem 99 4runner 3.4, stumbles/hesitates in reverse and idling in drive. Seems normal once up to speed.
Replaced: MAF, Plugs, Wires, Tested Coil packs they in spec, No engine code. Any ideas?
I have exact same problem 99 4runner 3.4, stumbles/hesitates in reverse and idling in drive. Seems normal once up to speed.
Replaced: MAF, Plugs, Wires, Tested Coil packs they in spec, No engine code. Any ideas?
#13
Registered User
How often is it recommended to replace the coils? And is there a difference between the coils for a 96 and a 2000?
Last edited by wii_tarded; 09-10-2014 at 07:50 AM.
Thread
Thread Starter
Forum
Replies
Last Post
Jnkml
95.5-2004 Tacomas & 96-2002 4Runners
3
07-06-2015 01:20 PM