Killgore Trout

hmmm, could your timing be out of wack, those vac advance diaphragms love to go out,.....as far as vac leaks go,...when your truck is idling, does the idle go up or down if you try to choke it out by hand (cover the top of the carb only letting a little air through your fingers) i had the darnedest time finding a vac leak on mine, ended up being at the charcoal canister.
i also noticed a huge improvement after fixing a pretty bad exhaust leak, especially when dropping into the lower rpm range (like when coasting to a stop)
sorry youre havin such a rough time nailing it down, just thought id throw out some possibilities.

catfish21

iTrader: (1)

Just redone my exhaust and no when I stArt my truck it runs perfect and drives perfect just when I'm stopping how do I test to see if my advance is bad

Killgore Trout

the vac diaphragm on the distributor should hold vac indefinitely, you can draw a vac using a hand operated vac pump with a gauge and watch for the vac to drop, or you can suck on the end of a piece of vac line and if it feels like youre able to suck air through,...you have a pin hole, each vac port should hold vac independently (assuming you have two some only have one) so you can test one at a time without plugging the other one.

Killgore Trout

if it is bad, i recommend getting just the vac unit, its like 60 bucks from lc, from toyota it is insanely expensive

catfish21

iTrader: (1)

Ok well I'm still fighting this battle well when I pulled in from work today the truck didn't die but it was stumbling very bad and I heard something bubbling well my.gas tank was bubbling bad. Well I turned it off and start It right back up and like always it runs like a champ and idles fine and the gas tank wasn't bubbling so I'm really stumped and bout ready to bring to a mechanic if a fellow yota guy can't help thanks

catfish21

iTrader: (1)

Any info ??

gillesdetrail

iTrader: (1)

I don't know if it has been checked or said before but there is a little vent on top of the fuel tank, are you sure it is not clogged or blocked?

catfish21

iTrader: (1)

No I havnt checked that do you think that could be the culprit and how do u go about checking that

gillesdetrail

iTrader: (1)

Well to know if it is the culprit, when the truck starts to run like crap open the fuel cap. If you hear a sucking sound and it runs better, then that's your problem. You'll have to drop the tank or remove the bed to check that, it's a little vent on top of the fuel tank.

catfish21

iTrader: (1)

I don't really hear it sucking but I can here bubbles for sure

catfish21

iTrader: (1)

Well I just want to say I feel stupid but I changed my fuel filter this eavning and it is back to normal again o my tank must need cleaned very bad o changed the filter the last oil change so it didn't make it very far, I can't believe it made that big a difference but it's fixed for now and thanks for all the replies so maybe the others that was following alone change your filter and maybe think about getting your tank cleaned after 32 years of living I can imagine what's in there