Miss when trying to hold speed

[poppyal1]

Thanks fellas for trying to help me with this issue. It is still doing it despite what you have suggested. And I'm no longer getting any responses, so I guess I will close this thread. Again, thanks for your help. I tried.....

[MT-2500]

Originally Posted by poppyal1

Thanks fellas for trying to help me with this issue. It is still doing it despite what you have suggested. And I'm no longer getting any responses, so I guess I will close this thread. Again, thanks for your help. I tried.....

You need to check that fuel pressure.

You cannot leave home with good fuel pressure.

The only true test on a fuel pump is to check the direct fuel pressure from fuel pump.
A quick test is to block off the return line and see if fuel pressure comes up to 75-85 lbs.
But do not run the pump at full pressure very long.
Also when testing fuel pump and pressure you need to tape a gauge to outside windshield or outside mirror and drive it on the road for 20 -30 minutes
until the pump gets has run a while to check for a pump fading out after hot.

Hard to start cold or hot and fuel pressure testing guide lines.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
If pump has full pressure with return line blocked and low pressure without it blocked most usually the fuel pressure regulator is leaking or not holding pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak in system.
Post back fuel pressure readings.

[534BC]

Originally Posted by poppyal1

Exactly what would I be looking for with the wire issue? If there is a vac leak, would it be not as noticeable at high RPMs on a four banger? Thanks for the reply.....

Look for 1 wire with a much higher reading then the others. I can't say what's normal because it has been years since checking wires. It may also help you find some opens or gaps.

[poppyal1]

Thanks again. I'm sorry it took so long for my response. Had to spend some time in the hospital. Anyway, there was no noticeable difference in the reading of the wires. The only thing left is to take it to a dealer. And I'm not sure if the truck's value is high enough to pay for that. Thanks so much for your suggestions. If there are any more ideas, I would be happy to hear about them. I just wish I could check the fuel pressure. But I won't be able to do that one.

[poppyal1]

Hello to all that responded to my query. I apologize that I haven't been on for a bit, but I had nothing new to report. Now, I have. The problem has been identified . It is the "Clutch". Who woulda thought? Not me, for sure.
I again thank you for your interest and you help with this issue.

[MT-2500]

Originally Posted by poppyal1

Hello to all that responded to my query. I apologize that I haven't been on for a bit, but I had nothing new to report. Now, I have. The problem has been identified . It is the "Clutch". Who woulda thought? Not me, for sure.
I again thank you for your interest and you help with this issue.

You are welcome and glad you found the problem.
But a clutch will not cause a miss.
What is the clutch doing or not doing?
Good Luck