Sound like a bad coil or module , limp it to auto zone they will scan it for free
It could be a bad diaphragm in your EGR valve. They often used ported vacuum and if there is a leak it won't show up until you are at higher rpms. A quick check is to remove the vacuum line from the EGR and plug it. Retest and see if the issue resolves itself. If so, replace the EGR valve.
The biggest cause of engine bogging is low intake vacuum and a bad EGR valve can do it easily.
SOURCE: 1997 buick lasabre custom high idle, transmission, stalling
had same problem i would check the Idel Air Valve and also check all of your vaccum hose lines makeing sure there are no cracks or splits in rubber connectors if there is repair immediatelt because over time they start to dammage the internal parts fo the engine and if youve replace tps mass air etc. sounds like a vaccum hose problem
SOURCE: 94 Buick LaSabre Hesitation
Clean the sensor wire in the mass air flow sensor. Remove the tamper proof screws to remove the sensor holder and clean off the wire with carb spray or brake cleaner. Do not touch the wire with hands or rags.
SOURCE: I have a vortec 350 setting a trouble code P1345,
p1345 is a crank/cam sensor correlation fault possibly due to a
failure in this solenoid.other possible causes include engine timing
SOURCE: Have 1989 Lincoln Town Car. Transmisson will not
Are you sure the trans is in 3rd. Pull the stick into low gear accelerate shift to 2nd about 20 mph shift to 3rd about 35 mph then 4th about 50 mph. This will let me know how to go further with your problem. If you do this proceedure write the results on this Great FixYa Page!
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