Hi all, I have a 95' K1500 w/305. I am currently having issues with it not starting or being hard to start and not having power under a load, i.e, going up hills, hard acceleration, etc. Things i have checked or done:
Fuel Pressure: Check and is ok
Spark: Checked, had a yellow spark, replaced the coil, got a blue spark, that took care of the hard start, no start. it starts up and idles great now.
Fuel injectors: Looked at em, yep its spraying fuel.
Plugs and wires: Replaced them not long ago, pulled the plugs and rechecked the gap, sprayed the wires with water to check for arcing, Everything seemed ok.
Cap and Rotor: New
Egr Valve: I believe this may be the culprit, it seems to be actuating but it seems to be not holding vacuum, if i depress the inside and hold my finger over the inlet, it leaks down.
IAC: took out cleaned, seems to be working properly.
TPS: Checked with an OHMS meter and am getting varying reading when moving the throttle.
Vacuum Leaks: Checked all lines, found the PCV valve inlet to the throttle body broke, fixed still same issue.

I can rev the engine up when its in park all i want, no issues, the problems start when i put it in gear and push to pedal to go normally, if i take off real slow it will eventually pick up speed. Going up a hill is the same way, i press the pedal down hard and it acts like it wants to die, but if i let up, and go real slow i can barely get it to go.
I am pretty mechanically inclined but this has got me boggled.
Any other ideas? THanks for your time.

 

Sounds like a knock sensor to me. The knock sensor is what adjusts your timing whenever detonation is detected. If the truck is sitting at an idle and there is no load on the engine, then you shouldn't experience any detonation, but put a load on it going up a hill and that's another story.....

Not guaranteeing that's what it is...but it would defiantly be worth checking out :/

 

Your timing needs adjusting!

There is a bolt on the very back of your intake manifold, it holds down a bracket that holds down the distributor,
Loosen it a bit and turn the cap(and shaft) like 10 degrees clockwise while the engine is running( don't fall on the belts)
You'll know if you've got it right.

If it sound even worse set it back 20 degrees 😂,

Another way is to get a timing light and look for the marks while you turn the cap, I prefer to set it by sound, feel, etc. Just play with it until its right.

Probably like ten years too late with the reply, mlbut maybe someone will get use out of it.
1995 Chevy Silverado had the new generation body and interior with the old gen motor but dolled up with an aluminum intake manifold and things. It's a good year.

 

there's actually a wire under the passenger side dash, i believe its brown, your supposed to unhook that wire and set timing at or damn close to zero and the computer will adjust timing as needed.