ok stock 2.8 auto, been sitting for less than a month while i deal with other problems... went to take it out today, filled the tank and it was kinda hard to get it to idle, but after a few mins its just fine, putting around town (at 25) its just fine still, however on the way out of town (its 55 there) it starts to "chug" like its not firing off and on every second or so. and does so till im under 30mph. then its just fine again.

so i checked for codes, and only got the 12 nothing more.

it has a full tank of new gas
holds 41lbs of pressure (checked at the schrader)
all fluid levels seem fine
good oil pressure
alt (cs type) is at 14.4
newer battery

and it idles perfect (i tryed goosing it in nuteral and it still chugs)

where to start troubleshooting?

any help would be nice

thanks
=todd=

get 1 helper. start car. you put hands over exhaust tips, have helper rev it up. if you feel no big increase in flow, you likely hava clogged cat. Mine did it parked at work for a day, was fine on the way in, could not rev it at all on the way home.

check the exhaust flow cat maybe blocked

look at the motor at night to see if spark is escaping bad wires
and if the exhaust manifold is glowing

------------------
Question wonder and be wierd
are you kind?

^^^^ all excellent little easy checks.

Also change the fuel filter and have the battery checked.
Fuel filters are the least changed generally and cause the most problems.
Some batteries can go dead just sitting with a low charge,I diagnose new batteries as bad every week (99% wal mart)

Get a free battery check at autozone,and buy a 10$ fuel filter in case something nasty sat in it for a month.

good exhaust flow cat not blocked
no spark escaping look at the motor at night to see if spark is escaping bad wires
no exhaust manifold is glowing
good battery tested twice

had a friend with a scaner check, bad map sensor... must also have a bad computer... but she runs great now!

thanks and pluses
=todd=