Issues with going into gear

[Killer 87 K5]

I have an 87 chevy k5 blazer that sat up for 10 years without being driven. We have changed the whole fuel system, throttle body, radiator, cap, rotor, plugs, wires, distributor, O2 sensor, put new exhaust on, changed the oil and oil filter, MAP sensor, tempature sensor, TPS, and I'm sure I'm forgetting something so just ask and I'll tell u if we changed it or not.

The problem that we are having is that when we go to put it into gear, it will die on us. If you don't put it in gear, it will sit there and idle, sometimes killing itself and sometimes not. The only way that we have been able to drive it onto the trailer to bring it to the muffler shop was if we pushed the break and gas at the same time (power break it) and put it in gear, but once you got it into gear, you can't take your foot off the break while holding the gas to.

We are thinking it could be the torque converter, or some bad grounding for the alternator, what do y'all think???

 

[Bent77]

Vacuum leak

 

[Killer 87 K5]

Do u know which line could be leaking or where it is located

 

[Killer 87 K5]

Any other ideas anyone??

 

[Kain]

use carb cleaner or ether to check for the leak. if you use ether use it sparingly it can cause major damage if use incorrectly.

 

[Killer 87 K5]

Where do I spray it

 

[Kain]

when its running around the carb ,around the hoses, around the intake a little at a time.
short spurts, dont go overboard if you use ether. carb cleaner wont hurt much unless it backfires

 

[Killer 87 K5]

Since my truck is EFI do I spray it around the throttle body and on the hoses??

 

[Kain]

it shouldn't hurt it dont go over board

 

[Killer 87 K5]

What should I look for when I spray the carb cleaner? So u think it is a leaking vacuum hose?

 

[Deuling]

An rpm change

 

[Killer 87 K5]

So if it changes, we have a bad vacuum line some where??

 

[Kain]

it will rev the motor when it sucks it in.. and where you spray there is a leak in that area

 

[Kain]

or bad gasket seal

 

[Killer 87 K5]

Ok I'm going to try that and tell y'all what happens

 

[Deuling]

Take a good look at the big vac hose that goes from the back of the throttle body and over to the brake booster. Check those connections well.

 

[Killer 87 K5]

What should I look for on the connectors to tell if they are bad

 

[Killer 87 K5]

The big vacuum hose goes from the break booster then into a hard line that goes to the intake manifold and doesn't go to the back of the throttle body

 

[Deuling]

Just check them and make sure it's all tight. Spray around them too.

 

[diesel4me]

My '81 van had sat as long as your truck,and though it would fire right up and run decent in park,the minute you went to put it in gear and drive it forward or backward,it would just sputter out and die..made moving it a real chore..

I ended up rigging an old lawn mower gas tank up to the fuel pump's inlet hose (that normally goes to the gas tank)--then I filled it with fresh gas,and let it run a few minutes..you could hear the idle smoothing out and I think the valves may have been sticky too,soon it was purring like a kitten,and I could stab the throttle and it revved right up ,like never before..could bake the tires now if I wanted too.

I think the old fuel was so stale or watered down it only had enough power to run it with no load on it..