My 89 Olds Delta 88 still had a small miss compare to how it was running before
 

I have been repairing my 89 Olds Delta 88 on and off for the last 2 years I have had it. Well as of last Friday I replaced the Idle Air Control Valve (IAC), Cam and Crankshaft sensors and it made it run a little bit better buy taking out about 80 percent of the miss and shack it had when I was at a light or a stop sign. Well there is still a problem but I don't know what else it may be. So is it time for me to pay a shop to fix it or due yall think yall might be able to help me with it. I will list everything I have done below to it.

Here is the list.

Spark Plugs, Wires and a new Coil Pack about 6 months ago
O2 sensor About a year ago
Replaced the Intake Manifold Gasket, Fuel Filter and Air Filter about 3 months ago
New Fuel Injectors and Pressure Regulator about a year ago
New Shocks and Struts about a year and a half ago
Front and Rear Ball Joints
Inner and Outer Tie Rods in the front end
I have done more to it but I didn't want to bore yall so I gave the basics of what I have done so maybe yall might have a better chance at helping me with this. Thanks.

You only replaced one coil? have you tested the other two or checked your plugs again.one or a few may have been fouled if it hasnt been running right

I only have a single coil pack on my 89 Olds that all six wire plug into. Also I did have the wires checked and there are working fine.

Looks like this right? it should.what motor is in your car...the picture here is three coil packs bolted to an ICM

Yep that is the right one. I have a Series 1 3800 V6 in mine.

Ah yes i aplogize.I forgot the non series were all one pack.Well have you checked the plugs again.Also is your check engine light on?

I pulled all the plugs today and checked them along with checking the gap to make sure it was right which it was.

Alright well is the check engine light on..also have you retested the fuel pressure

Nope I have no check engine light on. Also yes I have had the fuel pressure rechecked by my local shop. They said it was in the normal range. Whatever that may be. They also said the pump was a little noise but they said that is normal for its age.