Hi!
I own a 1990 Pontiac Grand Prix, it’s a 4 doors Sedan.
3,1L Engine and front wheel drive. I have own this car since it was new. I need some help to clarify the faults in it. What can I start to search to find out the failure with it. I can hardly start it and when it starts and runs then it doesn’t runs well because the Engine runs with coughing king of sound. I have checked those air intake hoses but not results found. Please kind and give me some advice to search for the faulty part in my engine. This car has become a family member so that’s why I don’t want it to fail this mysterious way.
Thank everyone in advance for taking your time.

Pontiac Lover.