Misfire/stuttering

[Gnasher]

Mechanical issues won't cause sudden misfires. You're going to have to check everything, look for the obvious first, split hoses, vac pipes then start testing sensors.
Page 8-114 of workshop manual
CHECKING THE COOLANT TEMPERATURE SENSOR ..................8-114
CHECKING THE THROTTLE POSITION SENSOR...........................8-115
CHECKING THE SUB-THROTTLE POSITION SENSOR..................8-115
CHECKING THE AIR INDUCTION SYSTEM SOLENOID .................8-116
CHECKING THE ATMOSPHERIC PRESSURE SENSOR.................8-116
CHECKING THE CYLINDER IDENTIFICATION SENSOR ................8-117
CHECKING THE INTAKE AIR PRESSURE SENSOR .......................8-117
CHECKING THE INTAKE AIR TEMPERATURE SENSOR ................8-118