This is weird. I'm getting this what feels like a miss at cruising speed, it is noticable when the torque converter locks up. I'm not sure what it feels like when the engine misses but think this may be it. It feels like a light stumble, is that miss firing? I'm not getting any codes at all. Could be time for new plugs? wires look fine, the plugs are ngk iridium about 15000 old. How bout a loose belt could that cause any drivabilty issues?
I think its a bit loose. On the tensioner it looks like this...
i
I I I I
Im not sure if that makes any cents but the bottom lines are the marks on the tensioner and the i up top is the arrow pointing to the tensioner, moving the tensioner causes the arrow to change where it points.

I will go get new plugs and an o2 sensor to see if that helps any. I'm just not sure if the belt being loose is affecting anything.

Belt slip would be more obvious at WOT. Get an oversized ZZP idler to solve the tension position.

Does it do this when the car is cold, warm or always? Have you tried the coil pack troubleshooting in Techinfo? Also consider checking your TPS. A dead spot won't always throw a code or light. If the cruise is engaged during the 'miss' does it disengage?

it always does it when ever the rpms are low but not accerating only when cruising at low rpm'* and only when the torque converter locks up. haven't check out the coil troubleshooting but i will right now

Really super dumb question but what is the tool called to check the coilpacks. I think I know what tool it is but I cant think of the name for it

Ohmmeter. DVM (digital volt meter). Any of them will check resistance. TPS the same.

Do you know what read out i should get for the tps on the ohm meter? i havent tested the coils yet but i am tonight as well as replacing the plugs and o2.

Hey Red Baron,
Have the exact same problem -only when it'* in OD lock-up. It'* like there isn't enough fuel being fed and especially on hills (even the slightest incline) it refuses to hold speed and the speed drops, even when I keep hitting accel, and only after reaches the peak of the hill will it regain the speed.
I don't really have any money to buy parts for troubleshooting, but I am hpping to do some troubleshooting and if I find anything out I'll be sure to keep you guys informed on my findings.
Martin

Blue, I expect yours would be ignition also. It'* more obvious when the TC locks up and the engine drops to a lower RPM. Your alternator is also putting out less at that RPM, which can compound the problem.

Baron....the TPS readings were posted here within the last 2 weeks. I'm on the way out the door......if you can't find them, PM me.

I tested the coil packs and they were good.

I guess it could have be one of three things.

-Plugs. I took out the NGK TR55 IX only 15000kms on them. This is the second time I'v taken them out since I got them and both times the gap increased 1 thou. I installed TR55'* this time they are one heat range colder.

-O2 sensor. The one that was on the car was a bosch installed when I got the car, replaced with an AC Delco.

-Throttle body. Man was that thing gross, I took it off and removed the sensors before cleaning. I used a can of TB cleaner some brake cleaner and an old tooth brush. It came out looking almost new. Its weird I clean the throttle body on the car every oil change and with it off looks like it has never been cleaned.

What ever it was that fixed the stumble I'm just glad its good. The car also runs better than it has ever ran since I'v owned it, the throttle response is a million times better and it is smoooooth as hell.

Two thoughts.....your throttle response gain was due to thoroghly cleaning the TB. I know that from experience.

And.......

With that pulley and intake combination, you'll probably still have plug problems until you drop ANOTHER heat range colder to the TR6. I just did that 2 weeks ago.