moondoggy1302

so sellin my 70 chevelle and its always ran great exept for a week ago took it for a drive and as soon as i hit crusin spped no matter it be 40mph or 70 mph the thing just wants to fall on its face starts feeling like its mis fireing. Car is fine underacceleration but after i lay off the gas it starts to sputter pretty bad and the more gas i give it to more sputtery/jerky it gets. and idea whats wrong with it? Need to know asap Im sellin it in two days!!!!
car has a 350 SB 30 over holley 850 double pumper vortec heads big cam....
oh and everything runs normal oil pressure is 50, temp is around 190, hopefully its just something with the carb but i tried leaning it out and still the same prob.......HELP!!!

ZONES89RS

iTrader: (25)

That is way too much carb, but besides that, if it was fine till recently, i say check the idle feed, might want to tear the carb apart and clean it, sounds like some trash has worked its way into some feed passages.

TT610INCH

put a new filter in it to!

mrdragster1970

.

No changes & it suddenly has an issue. Start cleaning stuff as mentioned!!

.

moondoggy1302

if i blew my power valve would it be acting like this???? one side of the carb is blocked off. car is fine at idle, fine under acceleration, filter is clean

moondoggy1302

oh and the only thing that changed was i noticed the engine was runnin a little hotter then normal and and oil pressure was down to like thrity. Oil was really low although dunno how that happened cuz there are no leaks might be the type of breathers i was runnin. But anyways so that was the only thing that changed sence then have changed the oil and now it acts like this. Could it have something to do with the timing?

ZONES89RS

iTrader: (25)

Deffinatly check the power valve.

moondoggy1302

I will when i get home but woultdn't the idle be all jack wild if the power valve was blown???? cuz the car idles fine

MrOverkill

iTrader: (1)

Check the air bleeds for restriction or debris......