I already know what you mean pal. The pulsating you feel when you are cruising is very annoying although it does not effect performance but here's your answer.
Timing and Ignition!!! If you are using low octane such as 89 or even 91, you have to tune your car to run that otherwise you run lean and while you are driving, your car tends to "dehydrate "LOLOL because it's wondering where fuel is.
Also there is a stupid carburetor like function on your intake called "Cold Start Screw" It's ta very tiny screw located on the upper intake between the Idle screw and TPS screw. I back it all the way off because it is a useless piece. The computer makes the engine run at a higher rpm when it's cold and then it goes to operateing temp mode.
Here's a shorter answer for your pumping issue...
Use The octane suggested - 93 octane
Change your Plugs and wires
BIGGEST THING TO CHECK - POSITIVE BATTERY CABLE AND GROUND CABLE: WHEN THE BATTERY CABLE CRAPS OUT, IT TENDS TO GIVE YOU LOW VOLTAGE THUS YOUR SPARK IS NOT HOT ENOUGH AND SO FORTH. WHEN GROUND WIRE CRAPS, YOU SHOULD KNOW WHAT STARTS THEN...
If you choose to use cheap gas, Tune your car to do so and do not believe everyone about using a laptop, they are retards. You tune the car like you would a Carb'd mustang or even a 5.0... Timing light! and you have a distributor but it's actually called a crank sensor.
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