I was driving last night in my older Grand Caravan with 270,000km on it when I floored it and suddenly it started misfiring and shuddering. I tried taking my foot off the pedal to slow down but it got worse so I kept it steady at 80km/hr. The whole ten seconds this is going on the dash is chiming and the check engine light is flashing, however this was temporary and I was close to home probably under 5km and didn’t notice anything else on the way back, also idled it this morning no problem.

I have an OBD2 Scanner from Innova and put the freeze frame information for the P0303 code in a spreadsheet

FUEL SYS 1

OL DRIVE

FUEL SYS 2

OL DRIVE

CALC LOAD (%)

100.0

ECT (F)

185

STFT B1 (%)

0

LTFT B1 (%)

0

STFT B2 (%)

0

LTFT B2 (%)

0

MAP (inHg)

27.8

Eng RPM

4991

Veh Speed (Mph)

55

Spark adv (.)

15.0

IAT (.F)

37

TPS (%)

86.7

RUN TIME (SEC)

192

COMMAND EVAP(%)

0.0

FUEL LEVEL (%)

33.7

BARO (InHg)

28.6

ECU Volts (V)

14.437

LOAD Value (%)

103.5

EQ Ratio

0.895

Rel TPS (%)

76.1

AMBIENT (.F)

30

TPS B(%)

86.3

ACC Pedal D(%)

91.4

ACC Pedal E (%)

45.5

Command TAC (%)

76.1

if I have to replace the cat I think I will just scrap the car so hopefully nothing expensive! I appreciate any insight or solutions!