1994 Buick Skylark Cold Start Stalls

Suggested Repair

Check fuel pressure and watch whether it drops quickly. A rapid drop most likely indicates a failed fuel pressure regulator; continue diagnosis from the pressure test results.

Conversation Summary

The owner of a 1994 Buick Skylark reports cold-start stalling in single-digit temperatures after replacing major ignition parts, changing the fuel filter, and machine-cleaning the injectors. The engine fires briefly, stalls, and needs repeated attempts with the pedal partly depressed before it runs normally until it sits overnight. Occasional severe hesitation off the line was also reported. The expert recommends checking fuel pressure for a quick drop, which would most likely indicate a failed fuel pressure regulator.