Issue resolved. It was the TPS. With a new TPS all is well.

I am now inclined to think its a drivetrain issue. The shake at idle is gone with new injectors. But at speed when maintaining constant i feel a jerking as if tranny is trying to down and up shift at the same time.
This evening i started hearing a creaking noise coming from the driver side front ...

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slight rocking side to side? at what speed please?
explain this rocking pl.

Happy New Year!

It happens when maintaining constant speed and only after the car really warms up.

So if i drive it for 20 mins from cold start, i'd not experience it but ...

Were you able to resolve this?

96 SSEi wrote:jerking at speed? is there a misfire? if you have scanner, check for misfire.

Its a very slight rocking feeling at speed.
no codes, scan tool does not show any misfires

Update:

Put in a new FPR, now i have 50PSI key on. 48PSI engine running and goes up to 52PSI when throttle is applied
So i am ruling out fuel issue.
New MAF
New Coils
New ICM
New Spark Plugs and Leads
All of this is genuine GM parts or AC Delco.

Idle is solid when in Drive(waiting on red lights ...

Fuel filter is new. no gas when i remove vacuum line. Driveability issue still there with highway speeds, very slight jerking.

Update:

I checked MAF readings again with the new MAF. Turns out it was a similar looking MAF but not for the SC engine. I got the right MAF and no more codes.

Fuel pressure is still low IMO. I still have a slight hesitation under load at highway speeds.

I am reading 38PSI with vacuum connected ...

O2 sensor is hooked up correctly.
Any tips on the fuel pressure reading? I have 38 PSI when in the on position or start.

I feel this is low. Should i look at replacing regulator first or fuel pump?

Checked with Torque APP:
Both O2s are running 0.0V when MAF is connected.

With No MAF 0.8 and 0.9V

I redid the vacuum harness using plastic vacuum lines and some tees and other connectors i had. No vacuum leaks in the car, smoke tested.

Fuel pressure is 38-40 PSI.

So what is the recommended ...

Delete - Double Posted

I will check the wiring to O2 sensor, making sure its not in touch with the leads.
Any tips on replacing the O2 sensor. Where are the connectors?

I will also order a new 3800 Vacuum Harness.

Thanks.

Based on your codes, I'd figure out which O2 sensor that is and replace it.

I'd also run some ...

I tested the coils; i bought one new and tried to switch it around. Nothing.
I decided that it was time for coils and ICM anyway and got Delphi coils and Delphi ICM. Replaced it and applied thermal paste. Still the same.
Still got that bucking when doing constant speed. Thought i may as well clean ...

Thanks for the input.

I will disconnect the MAF and test
Will also replace the coil. I have ordered one and will swap it around to see.

The shake bothers me less, i need to figure this miss first.

I am new to this forum and i have tried to search for my issue, i have not landed on a thread that can help me and hence i am asking this question here.

2000 Bonneville SSEi

138000 KMS - Canadian Car

I had the random miss at idle when in park and car would rock a little bit.
I decided to do the ...