I just bought a 1993 chevy 1 ton with a 454. It was running rough when i bought it, took it home to do a tune up, found out the cap was cracked and it runs a drives smooth and good except for one part.

Under light acceleration, it has tons of torque and power, but when i step on it, it still moves good, but seems like it roors a lot and doesnt move as much as it should. it feels like it has more power when you accelerate less, and vice versa.

It has new rotor cap plugs and wires, I just drove it 2200 miles last week and ran fuel injector cleaner through it at every fill up.

Where should i start looking?

tranny?

welcome to the world of the 230 hp toilet bowl Injection big block


dads van has the same motor... When you floor it it doesn't go much faster, roars alot and sounds like a tornado LOL!

I would start by looking at the catalytic converter. That is the typical symptom when they start to get plugged up (my 90 f350 did the same thing). The other thing to check is fuel pressure.

Bryan

My dad had a 1992 k2500 suburban w/ the same problem. Seems like they lean out when you give them the gas.

That's just how they were. The pre-vortec motors were slugs....... If I remember, edelbrock makes a kit to give them quite a bit more power....

Change the fuel filter.

I've had a badly plugged filter cause the sympoms you described.


good luck.


jt

Grab your cooling fan and make sure the fan clutch hasn't went bad(it will be stiff/solid locked up if its bad). Check cat convertor,fuel pressure and you could also pulll egr and check to make sure pintle valve is hung open causing your power drop. I had a 95 pre-vortec 454 truck,it ran terrible and got bad mileage. The banks kit makes it scream and picke up serious horse power.

I Have 1993 Suburban Had Same Problem. Fi On Those Motors Is Pure Junk I Put Performer Intake And Holley 650 Carb Got 4mpg Better And Motor Made Ton More Power Throw The Fi Away

for sale 600 hp 650 ft pd of torque. bought it straight out of jet boat with 6 hours run time, give nearly 4,800.00 for a engine that had in total with reciepts seen with my own eyes close to 7,000.00 with machine work problem is its running 12.1 compression and i need this for a boat engine, (right not applicabalbe but for sale, all trw part roller rocker pete jackson gear drive i have build sheet on engine heat tab on freeze out plugs this engine sounds close to a top fuel dragster with the set up in it 12.1 compression 170-175 cylinder pounds of pressure each
right close not running on pump gas only right on line, pistons trw 12.8 floating pins and bushed
total seal chromoly race rings arp stud bolts in heads 8 qt oil pan with remote oil location two filters with miloden windage tray
hv oil pump 120gph fuel pump
torker 2 intake
h-beam rods
factory forged crank turned
781 heads wit severe duty 2.19 1.88 stainless valves
clevite bearings
cam is custom grind rpm range 2800-6500
advance durantion 316/332
druation at .050=244/254
center line 105/115
lift .576/.604
lobe sep 110
matched valve springs and lifters, bought it thinking it would work for repower of stern drive engine, well its just to much compression i need to be in the 9.1 area with flat top hyperuetitic pistons this one for sale, for enough to build a big block that i need, paper work to show 600 at 650 ft pd torque.

6 running hours on engine complete oil pan to carb the picture you will see it will have glennwood logs they do not ocme there gone with boat, it was bought out from under me on my first run out, i kept engine he bought bought, i need stern drive application call steve 937 661 0010 i take 3,500.00 for complete engine and personally guarantee its capibilitys, its just simply not the enigne i need or someone build me what i need i want 500 hp for a 2300 sx sport chaparral. can you or are you interested obo. no lower then three tho i can tell ya that i have a little more invested with trade and cash but i need an engine summer is here email me so i can send pics.