Surging/dying 4.0

[kinda_low]

SOO, drving home from my exhaust appointment my 99 4.0/5spd Ranger started to feel like it was missing when I would let off the throttle. When I came to a stop it wanted to die. The idle is only at 500-600 and surging up and down. The rest of the drive was a bit scary on the frontage road cause it kept trying to stall out. When I tap the throttle the response time is horrible and the truck feels very underpowered.

I had to drive my explorer to work, I havent' had time to look into it yet.

Before I tear into it, any ideas or things to look for? Its not throwing any codes...yet. I'm thinking it feels like a fuel problem, so maybe the fuel pump?

Thanks in advance -Robert

 

[rpcaster]

SOO, drving home from my exhaust appointment my 99 4.0/5spd Ranger started to feel like it was missing when I would let off the throttle. When I came to a stop it wanted to die. The idle is only at 500-600 and surging up and down. The rest of the drive was a bit scary on the frontage road cause it kept trying to stall out. When I tap the throttle the response time is horrible and the truck feels very underpowered.

I had to drive my explorer to work, I havent' had time to look into it yet.

Before I tear into it, any ideas or things to look for? Its not throwing any codes...yet. I'm thinking it feels like a fuel problem, so maybe the fuel pump?

Thanks in advance -Robert

Hope this is not your problem, (but)!
There are many Ranger owners that had exhaust work using (arc-welders) and the shops did not remove battery ground lead, and fried the computer?

 

[snoman6115]

or jsut a toss up, check ur MAF. buy some cleaner at fleet its only like $4 dn my buddy had that problem, it would die on the highway when trying to accel, but it does sound more like ur comp may be fried

 

[kinda_low]

Well good thing they didn't touch my truck today! I made the appointment only to get told that I would have to come back tomorrow morning, but good thing they didn't get me in or I'd probably assume something like that happened.

I had a rough idle problem a couple months back that I cured by cleaning the MAF. I'll clean it again when I get home, but this feels way different than it did back then. Thanks for the quick replies!

 

[rangerrager]

vaccum leak possibly??

 

[KELLY88]

Ya vacuum leak sounds pretty likely. Might want to replace the fuel filter if it hasn't been done in a while. Also check your spark plug wires and make sure a connection didn't come loose resulting in misfires.

 

[Nhaz]

Theres a little cap on the vacuum line tree for a line not in use on my truck. its popped off a couple times.