1991 Zr1 bogging/jerking bad under acceleration

[Johnny5]

After checking the fuel
Pumps amps thanks to Marcs write up, ohming the spark plug wires to check coil packs, voltage test alternator, vacuum fittings etc. I found the rubber coupling that goes to the map sensor was loose. Once i put a new fitting on it stopped falling on it?s face/or engine dying. At full throttle now the secondaries open and run good but at normal driving/accelerating etc it still
Jerks but not as bad. I will pull the plenum and do a complete tune up along with all
New rubber for the vacuum lines etc. i have a feeling i have another small
Leaks.

[A26B]

Originally Posted by Johnny5

After checking the fuel
Pumps amps thanks to Marcs write up, ohming the spark plug wires to check coil packs, voltage test alternator, vacuum fittings etc. I found the rubber coupling that goes to the map sensor was loose. Once i put a new fitting on it stopped falling on it?s face/or engine dying. At full throttle now the secondaries open and run good but at normal driving/accelerating etc it still
Jerks but not as bad. I will pull the plenum and do a complete tune up along with all
New rubber for the vacuum lines etc. i have a feeling i have another small
Leaks.

Check all of your PCV system rubber parts for vacuum leaks while you are at it & the plenum is off.

(1) The Crankcase Ventilation Hoses under the plenum can get as hard as a rock. Mine were so hard, I pulled the aluminum tube completely out of the housing.
https://www.jerrysgaskets.com/hose-s...new-90-95-3b1/


(2) PCV Pipe Elbow Grommets.
https://www.jerrysgaskets.com/gromme...new-90-95-7e3/

(3) Dual PCV Valve Lower Hose & top Connector. Offered as a set for lower cost, if you need both.
My lower hose was rotted on the side facing the engine & hard on the firewall side. So bad it pulled completely in two when I removed it. Top Connector gets soft & no longer seals effectively on PCV Valves.
https://www.jerrysgaskets.com/hose-s...ew-90-95-13d3/

(4) For 1990 Models only, this part typically gets soft, swells & no longer seals effectively. Zip Ties don't work well on oval shaped, dual connectors. Before these were available, the fix was bending the pipes further apart & using 2 pieces of hose. No longer necessary to bend pipes, since this became available.
https://www.jerrysgaskets.com/connec...new-1990-13d4/

Jerrys Gaskets has manufactured all of these parts and are identical to the originals.

[Johnny5]

Yes thank you. I will give Jerry a call, order a full tune up besides injectors since i have FIC already & get rubber connectors + PCV valve rubbers.